From e5b9bce79b68a68ddd2e51daa16d2fea73b84fdb Mon Sep 17 00:00:00 2001
From: Prefetch
Date: Wed, 19 Oct 2022 20:03:25 +0200
Subject: Polish presentation, "fix" Unicode sorting

---
 source/know/category/index.md                      |  25 +++----------------
 source/know/concept/alfven-waves/index.md          |   1 +
 source/know/concept/archimedes-principle/index.md  |   1 +
 source/know/concept/bb84-protocol/index.md         |   1 +
 source/know/concept/bell-state/index.md            |   1 +
 source/know/concept/bells-theorem/index.md         |   1 +
 source/know/concept/beltrami-identity/index.md     |   1 +
 source/know/concept/bernoullis-theorem/index.md    |   1 +
 .../concept/bernstein-vazirani-algorithm/index.md  |   1 +
 source/know/concept/berry-phase/index.md           |   1 +
 source/know/concept/binomial-distribution/index.md |   7 +++---
 .../know/concept/blasius-boundary-layer/index.md   |   1 +
 source/know/concept/bloch-sphere/index.md          |   3 ++-
 source/know/concept/blochs-theorem/index.md        |   1 +
 source/know/concept/boltzmann-equation/index.md    |   7 +++---
 source/know/concept/boltzmann-relation/index.md    |   1 +
 .../concept/bose-einstein-distribution/index.md    |   1 +
 .../know/concept/calculus-of-variations/index.md   |   1 +
 source/know/concept/canonical-ensemble/index.md    |   1 +
 source/know/concept/capillary-action/index.md      |   1 +
 .../know/concept/cauchy-principal-value/index.md   |   1 +
 source/know/concept/cauchy-strain-tensor/index.md  |   1 +
 source/know/concept/cauchy-stress-tensor/index.md  |   1 +
 source/know/concept/cavitation/index.md            |   1 +
 source/know/concept/central-limit-theorem/index.md |   1 +
 .../know/concept/conditional-expectation/index.md  |   1 +
 source/know/concept/convolution-theorem/index.md   |   5 ++--
 source/know/concept/coulomb-logarithm/index.md     |   1 +
 source/know/concept/coupled-mode-theory/index.md   |   1 +
 source/know/concept/curvature/index.md             |   1 +
 .../know/concept/curvilinear-coordinates/index.md  |   7 +++---
 .../cylindrical-parabolic-coordinates/index.md     |   1 +
 .../concept/cylindrical-polar-coordinates/index.md |   1 +
 source/know/concept/debye-length/index.md          |   1 +
 source/know/concept/density-of-states/index.md     |   1 +
 source/know/concept/density-operator/index.md      |   1 +
 source/know/concept/detailed-balance/index.md      |   1 +
 .../know/concept/deutsch-jozsa-algorithm/index.md  |   1 +
 source/know/concept/dielectric-function/index.md   |   1 +
 .../concept/diffie-hellman-key-exchange/index.md   |   1 +
 source/know/concept/dirac-delta-function/index.md  |   5 ++--
 source/know/concept/dirac-notation/index.md        |   1 +
 source/know/concept/dispersive-broadening/index.md |   1 +
 source/know/concept/drude-model/index.md           |   1 +
 source/know/concept/dynkins-formula/index.md       |   1 +
 source/know/concept/dyson-equation/index.md        |   1 +
 source/know/concept/ehrenfests-theorem/index.md    |   1 +
 source/know/concept/einstein-coefficients/index.md |   1 +
 source/know/concept/elastic-collision/index.md     |   1 +
 .../concept/electric-dipole-approximation/index.md |   1 +
 source/know/concept/electric-field/index.md        |   1 +
 .../concept/electromagnetic-wave-equation/index.md |   1 +
 .../concept/equation-of-motion-theory/index.md     |   3 ++-
 source/know/concept/euler-bernoulli-law/index.md   |   3 ++-
 source/know/concept/euler-equations/index.md       |   1 +
 source/know/concept/fabry-perot-cavity/index.md    |   1 +
 .../know/concept/fermi-dirac-distribution/index.md |   1 +
 source/know/concept/fermis-golden-rule/index.md    |   1 +
 source/know/concept/feynman-diagram/index.md       |   1 +
 source/know/concept/ficks-laws/index.md            |   1 +
 source/know/concept/fourier-transform/index.md     |   5 ++--
 source/know/concept/fredholm-alternative/index.md  |   1 +
 source/know/concept/fundamental-solution/index.md  |   5 ++--
 .../fundamental-thermodynamic-relation/index.md    |   1 +
 source/know/concept/ghz-paradox/index.md           |   1 +
 .../know/concept/grad-shafranov-equation/index.md  |   1 +
 source/know/concept/gram-schmidt-method/index.md   |   1 +
 .../know/concept/grand-canonical-ensemble/index.md |   1 +
 source/know/concept/greens-functions/index.md      |   1 +
 .../concept/gronwall-bellman-inequality/index.md   |   7 +++---
 source/know/concept/guiding-center-theory/index.md |   3 ++-
 .../concept/hagen-poiseuille-equation/index.md     |   1 +
 source/know/concept/hamiltonian-mechanics/index.md |   5 ++--
 source/know/concept/harmonic-oscillator/index.md   |   1 +
 .../know/concept/heaviside-step-function/index.md  |   3 ++-
 source/know/concept/heisenberg-picture/index.md    |   1 +
 .../know/concept/hellmann-feynman-theorem/index.md |   1 +
 source/know/concept/hermite-polynomials/index.md   |   1 +
 source/know/concept/hilbert-space/index.md         |   1 +
 source/know/concept/holomorphic-function/index.md  |   7 +++---
 source/know/concept/hookes-law/index.md            |   1 +
 source/know/concept/hydrostatic-pressure/index.md  |   1 +
 source/know/concept/imaginary-time/index.md        |   1 +
 source/know/concept/impulse-response/index.md      |   3 ++-
 source/know/concept/index.md                       |  27 ++++-----------------
 source/know/concept/interaction-picture/index.md   |   1 +
 source/know/concept/ion-sound-wave/index.md        |   1 +
 source/know/concept/ito-integral/index.md          |   1 +
 source/know/concept/ito-process/index.md           |   3 ++-
 source/know/concept/jellium/index.md               |   1 +
 source/know/concept/kolmogorov-equations/index.md  |   1 +
 .../know/concept/kramers-kronig-relations/index.md |   1 +
 source/know/concept/kubo-formula/index.md          |   1 +
 source/know/concept/lagrange-multiplier/index.md   |   1 +
 source/know/concept/lagrangian-mechanics/index.md  |   1 +
 source/know/concept/laguerre-polynomials/index.md  |   1 +
 source/know/concept/landau-quantization/index.md   |   1 +
 source/know/concept/langmuir-waves/index.md        |   1 +
 source/know/concept/laplace-transform/index.md     |   5 ++--
 source/know/concept/larmor-precession/index.md     |   1 +
 source/know/concept/laser-rate-equations/index.md  |   1 +
 .../know/concept/laws-of-thermodynamics/index.md   |   1 +
 source/know/concept/lawson-criterion/index.md      |   1 +
 source/know/concept/legendre-polynomials/index.md  |   1 +
 source/know/concept/legendre-transform/index.md    |   1 +
 .../know/concept/lehmann-representation/index.md   |   1 +
 source/know/concept/lindhard-function/index.md     |   3 ++-
 source/know/concept/lorentz-force/index.md         |   1 +
 source/know/concept/lubrication-theory/index.md    |   1 +
 source/know/concept/magnetic-field/index.md        |   1 +
 source/know/concept/magnetohydrodynamics/index.md  |   1 +
 source/know/concept/markov-process/index.md        |   1 +
 source/know/concept/martingale/index.md            |   1 +
 source/know/concept/material-derivative/index.md   |   1 +
 .../concept/matsubara-greens-function/index.md     |   1 +
 source/know/concept/matsubara-sum/index.md         |   1 +
 .../know/concept/maxwell-bloch-equations/index.md  |   3 ++-
 .../maxwell-boltzmann-distribution/index.md        |   1 +
 source/know/concept/maxwell-relations/index.md     |   1 +
 source/know/concept/maxwells-equations/index.md    |   1 +
 source/know/concept/meniscus/index.md              |   1 +
 source/know/concept/metacentric-height/index.md    |   5 ++--
 source/know/concept/metacentric-height/sketch.jpg  | Bin 0 -> 39522 bytes
 source/know/concept/metacentric-height/sketch.png  | Bin 71440 -> 0 bytes
 .../know/concept/microcanonical-ensemble/index.md  |   1 +
 .../know/concept/modulational-instability/index.md |   1 +
 .../know/concept/multi-photon-absorption/index.md  |   3 ++-
 .../know/concept/navier-cauchy-equation/index.md   |   1 +
 .../know/concept/navier-stokes-equations/index.md  |   1 +
 source/know/concept/newtons-bucket/index.md        |   1 +
 source/know/concept/no-cloning-theorem/index.md    |   1 +
 source/know/concept/optical-wave-breaking/index.md |   1 +
 source/know/concept/parsevals-theorem/index.md     |   1 +
 .../partial-fraction-decomposition/index.md        |   1 +
 .../concept/path-integral-formulation/index.md     |   1 +
 .../concept/pauli-exclusion-principle/index.md     |   1 +
 source/know/concept/plancks-law/index.md           |   1 +
 source/know/concept/prandtl-equations/index.md     |   1 +
 source/know/concept/probability-current/index.md   |   1 +
 source/know/concept/propagator/index.md            |   1 +
 source/know/concept/pulay-mixing/index.md          |   1 +
 source/know/concept/quantum-entanglement/index.md  |   1 +
 .../concept/quantum-fourier-transform/index.md     |   1 +
 source/know/concept/quantum-gate/index.md          |   1 +
 source/know/concept/quantum-teleportation/index.md |   1 +
 source/know/concept/rabi-oscillation/index.md      |   1 +
 .../concept/random-phase-approximation/index.md    |   1 +
 source/know/concept/random-variable/index.md       |   1 +
 .../concept/rayleigh-plateau-instability/index.md  |   1 +
 .../concept/rayleigh-plesset-equation/index.md     |   1 +
 source/know/concept/reduced-mass/index.md          |   1 +
 source/know/concept/renyi-entropy/index.md         |   1 +
 source/know/concept/repetition-code/index.md       |   1 +
 source/know/concept/residue-theorem/index.md       |   3 ++-
 source/know/concept/reynolds-number/index.md       |   1 +
 source/know/concept/ritz-method/index.md           |   1 +
 .../concept/rotating-wave-approximation/index.md   |   1 +
 source/know/concept/runge-kutta-method/index.md    |   1 +
 source/know/concept/rutherford-scattering/index.md |   1 +
 source/know/concept/salt-equation/index.md         |   1 +
 source/know/concept/schwartz-distribution/index.md |   1 +
 source/know/concept/screw-pinch/index.md           |   1 +
 source/know/concept/second-quantization/index.md   |   1 +
 source/know/concept/selection-rules/index.md       |   1 +
 source/know/concept/self-energy/index.md           |   1 +
 source/know/concept/self-phase-modulation/index.md |   1 +
 source/know/concept/self-steepening/index.md       |   1 +
 source/know/concept/shors-algorithm/index.md       |   1 +
 source/know/concept/sigma-algebra/index.md         |   3 ++-
 source/know/concept/simons-algorithm/index.md      |   1 +
 source/know/concept/slater-determinant/index.md    |   1 +
 .../concept/sokhotski-plemelj-theorem/index.md     |   1 +
 source/know/concept/spherical-coordinates/index.md |   1 +
 source/know/concept/spitzer-resistivity/index.md   |   1 +
 .../know/concept/step-index-fiber/bessel-small.jpg | Bin 0 -> 145251 bytes
 source/know/concept/step-index-fiber/index.md      |   5 ++--
 .../know/concept/step-index-fiber/modes-small.jpg  | Bin 0 -> 91467 bytes
 source/know/concept/stochastic-process/index.md    |   1 +
 source/know/concept/stokes-law/index.md            |   1 +
 .../know/concept/sturm-liouville-theory/index.md   |   1 +
 source/know/concept/superdense-coding/index.md     |   1 +
 .../know/concept/thermodynamic-potential/index.md  |   1 +
 .../time-dependent-perturbation-theory/index.md    |   1 +
 .../time-independent-perturbation-theory/index.md  |   1 +
 source/know/concept/time-ordered-product/index.md  |   1 +
 source/know/concept/toffoli-gate/index.md          |   1 +
 source/know/concept/two-fluid-equations/index.md   |   1 +
 source/know/concept/viscosity/index.md             |   1 +
 source/know/concept/von-neumann-extractor/index.md |   1 +
 source/know/concept/vorticity/index.md             |   1 +
 source/know/concept/wetting/index.md               |   1 +
 source/know/concept/wicks-theorem/index.md         |   1 +
 source/know/concept/wiener-process/index.md        |   1 +
 source/know/concept/wkb-approximation/index.md     |   1 +
 source/know/concept/young-dupre-relation/index.md  |   1 +
 source/know/concept/young-laplace-law/index.md     |   1 +
 source/know/index.md                               |   2 +-
 197 files changed, 243 insertions(+), 87 deletions(-)
 create mode 100644 source/know/concept/metacentric-height/sketch.jpg
 delete mode 100644 source/know/concept/metacentric-height/sketch.png
 create mode 100644 source/know/concept/step-index-fiber/bessel-small.jpg
 create mode 100644 source/know/concept/step-index-fiber/modes-small.jpg

(limited to 'source/know')

diff --git a/source/know/category/index.md b/source/know/category/index.md
index 9952eba..2772a9f 100644
--- a/source/know/category/index.md
+++ b/source/know/category/index.md
@@ -6,28 +6,11 @@ layout: "default"
 
 # List of categories
 
-{% assign by_letter = site.pages
+This is an alphabetical list of the categories in this knowledge base.
+
+{% assign pages_by_letter = site.pages
   | where_exp: "item", "item.layout == 'category'"
   | group_by_exp: "item", "item.title | truncate: 1, ''"
   | sort: "name"
 %}
-
-This is an alphabetical list of the categories in this knowledge base.
-
-<div style="text-align: center;">
-&hyphen; 
-{% for letter in by_letter %}
-<a href="#{{ letter.name }}">{{ letter.name }}</a>
-&hyphen; 
-{% endfor %}
-</div>
-
-{% for letter in by_letter %}
-<h2 id="{{ letter.name }}">{{ letter.name }}</h2>
-<ul>
-  {% assign items = letter.items | sort: "title" %}
-  {% for item in items %}
-  <li><a href="{{ item.url }}">{{ item.title }}</a></li>
-  {% endfor %}
-</ul>
-{% endfor %}
+{% include alphlist.html pages_by_letter = pages_by_letter %}
diff --git a/source/know/concept/alfven-waves/index.md b/source/know/concept/alfven-waves/index.md
index 9c5e460..c560c67 100644
--- a/source/know/concept/alfven-waves/index.md
+++ b/source/know/concept/alfven-waves/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Alfvén waves"
+sort_title: "Alfven waves" # sic
 date: 2022-01-31
 categories:
 - Physics
diff --git a/source/know/concept/archimedes-principle/index.md b/source/know/concept/archimedes-principle/index.md
index 4bab87b..dc02d12 100644
--- a/source/know/concept/archimedes-principle/index.md
+++ b/source/know/concept/archimedes-principle/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Archimedes' principle"
+sort_title: "Archimedes' principle"
 date: 2021-04-10
 categories:
 - Fluid statics
diff --git a/source/know/concept/bb84-protocol/index.md b/source/know/concept/bb84-protocol/index.md
index 95ba720..1091773 100644
--- a/source/know/concept/bb84-protocol/index.md
+++ b/source/know/concept/bb84-protocol/index.md
@@ -1,5 +1,6 @@
 ---
 title: "BB84 protocol"
+sort_title: "BB84 protocol"
 date: 2021-03-06
 categories:
 - Quantum information
diff --git a/source/know/concept/bell-state/index.md b/source/know/concept/bell-state/index.md
index 15b916d..5f333a2 100644
--- a/source/know/concept/bell-state/index.md
+++ b/source/know/concept/bell-state/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Bell state"
+sort_title: "Bell state"
 date: 2021-03-09
 categories:
 - Quantum mechanics
diff --git a/source/know/concept/bells-theorem/index.md b/source/know/concept/bells-theorem/index.md
index 1752854..3b71dbf 100644
--- a/source/know/concept/bells-theorem/index.md
+++ b/source/know/concept/bells-theorem/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Bell's theorem"
+sort_title: "Bell's theorem"
 date: 2021-03-28
 categories:
 - Physics
diff --git a/source/know/concept/beltrami-identity/index.md b/source/know/concept/beltrami-identity/index.md
index e9d7a4c..3fa566c 100644
--- a/source/know/concept/beltrami-identity/index.md
+++ b/source/know/concept/beltrami-identity/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Beltrami identity"
+sort_title: "Beltrami identity"
 date: 2022-09-17
 categories:
 - Physics
diff --git a/source/know/concept/bernoullis-theorem/index.md b/source/know/concept/bernoullis-theorem/index.md
index c7f7483..12bd0ca 100644
--- a/source/know/concept/bernoullis-theorem/index.md
+++ b/source/know/concept/bernoullis-theorem/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Bernoulli's theorem"
+sort_title: "Bernoulli's theorem"
 date: 2021-04-02
 categories:
 - Physics
diff --git a/source/know/concept/bernstein-vazirani-algorithm/index.md b/source/know/concept/bernstein-vazirani-algorithm/index.md
index 8720c81..af49841 100644
--- a/source/know/concept/bernstein-vazirani-algorithm/index.md
+++ b/source/know/concept/bernstein-vazirani-algorithm/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Bernstein-Vazirani algorithm"
+sort_title: "Bernstein-Vazirani algorithm"
 date: 2021-05-01
 categories:
 - Quantum information
diff --git a/source/know/concept/berry-phase/index.md b/source/know/concept/berry-phase/index.md
index b95788a..eedc548 100644
--- a/source/know/concept/berry-phase/index.md
+++ b/source/know/concept/berry-phase/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Berry phase"
+sort_title: "Berry phase"
 date: 2021-11-29
 categories:
 - Physics
diff --git a/source/know/concept/binomial-distribution/index.md b/source/know/concept/binomial-distribution/index.md
index c25da3d..14ba4cb 100644
--- a/source/know/concept/binomial-distribution/index.md
+++ b/source/know/concept/binomial-distribution/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Binomial distribution"
+sort_title: "Binomial distribution"
 date: 2021-02-26
 categories:
 - Statistics
@@ -46,7 +47,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-mean"/>
 <label for="proof-mean">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-mean">Proof.</label>
 The trick is to treat $p$ and $q$ as independent until the last moment:
 
@@ -76,7 +77,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-var"/>
 <label for="proof-var">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-var">Proof.</label>
 We use the same trick to calculate $\overline{n^2}$
 (the mean squared number of successes):
@@ -121,7 +122,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-normal"/>
 <label for="proof-normal">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-normal">Proof.</label>
 We take the Taylor expansion of $\ln\!\big(P_N(n)\big)$
 around the mean $\mu = Np$:
diff --git a/source/know/concept/blasius-boundary-layer/index.md b/source/know/concept/blasius-boundary-layer/index.md
index 86b0e02..fd4af57 100644
--- a/source/know/concept/blasius-boundary-layer/index.md
+++ b/source/know/concept/blasius-boundary-layer/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Blasius boundary layer"
+sort_title: "Blasius boundary layer"
 date: 2021-05-29
 categories:
 - Physics
diff --git a/source/know/concept/bloch-sphere/index.md b/source/know/concept/bloch-sphere/index.md
index d333c50..5d747f7 100644
--- a/source/know/concept/bloch-sphere/index.md
+++ b/source/know/concept/bloch-sphere/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Bloch sphere"
+sort_title: "Bloch sphere"
 date: 2021-03-09
 categories:
 - Quantum mechanics
@@ -13,7 +14,7 @@ the **Bloch sphere** is an invaluable tool to visualize qubits.
 All pure qubit states are represented by a point on the sphere's surface:
 
 <a href="bloch.jpg">
-<img src="bloch-small.jpg" style="width:50%">
+<img src="bloch-small.jpg" style="width:60%">
 </a>
 
 The $x$, $y$ and $z$-axes represent the components of a spin-1/2-alike system,
diff --git a/source/know/concept/blochs-theorem/index.md b/source/know/concept/blochs-theorem/index.md
index 496d8d3..e049a71 100644
--- a/source/know/concept/blochs-theorem/index.md
+++ b/source/know/concept/blochs-theorem/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Bloch's theorem"
+sort_title: "Bloch's theorem"
 date: 2021-02-22
 categories:
 - Quantum mechanics
diff --git a/source/know/concept/boltzmann-equation/index.md b/source/know/concept/boltzmann-equation/index.md
index 6193fe6..20399df 100644
--- a/source/know/concept/boltzmann-equation/index.md
+++ b/source/know/concept/boltzmann-equation/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Boltzmann equation"
+sort_title: "Boltzmann equation"
 date: 2022-10-02
 categories:
 - Physics
@@ -147,7 +148,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-moment0"/>
 <label for="proof-moment0">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-moment0">Proof.</label>
 We insert $Q = m$ into our prototype,
 and since $m$ is constant, the rest is trivial:
@@ -175,7 +176,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-moment1"/>
 <label for="proof-moment1">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-moment1">Proof.</label>
 We insert $Q = m \vb{v}$ into our prototype and recognize $\rho$ wherever possible:
 
@@ -237,7 +238,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-moment2"/>
 <label for="proof-moment2">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-moment2">Proof.</label>
 We insert $Q = m |\vb{v}|^2 / 2$ into our prototype and recognize $\rho$ wherever possible:
 
diff --git a/source/know/concept/boltzmann-relation/index.md b/source/know/concept/boltzmann-relation/index.md
index 6dd04d2..b7f82b7 100644
--- a/source/know/concept/boltzmann-relation/index.md
+++ b/source/know/concept/boltzmann-relation/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Boltzmann relation"
+sort_title: "Boltzmann relation"
 date: 2021-10-18
 categories:
 - Physics
diff --git a/source/know/concept/bose-einstein-distribution/index.md b/source/know/concept/bose-einstein-distribution/index.md
index 8397a8f..594d6e0 100644
--- a/source/know/concept/bose-einstein-distribution/index.md
+++ b/source/know/concept/bose-einstein-distribution/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Bose-Einstein distribution"
+sort_title: "Bose-Einstein distribution"
 date: 2021-07-11
 categories:
 - Physics
diff --git a/source/know/concept/calculus-of-variations/index.md b/source/know/concept/calculus-of-variations/index.md
index 81d9a5f..0b1d070 100644
--- a/source/know/concept/calculus-of-variations/index.md
+++ b/source/know/concept/calculus-of-variations/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Calculus of variations"
+sort_title: "Calculus of variations"
 date: 2021-02-24
 categories:
 - Mathematics
diff --git a/source/know/concept/canonical-ensemble/index.md b/source/know/concept/canonical-ensemble/index.md
index aca2a33..dd7fe90 100644
--- a/source/know/concept/canonical-ensemble/index.md
+++ b/source/know/concept/canonical-ensemble/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Canonical ensemble"
+sort_title: "Canonical ensemble"
 date: 2021-07-10
 categories:
 - Physics
diff --git a/source/know/concept/capillary-action/index.md b/source/know/concept/capillary-action/index.md
index b388389..1ee3cd4 100644
--- a/source/know/concept/capillary-action/index.md
+++ b/source/know/concept/capillary-action/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Capillary action"
+sort_title: "Capillary action"
 date: 2021-03-29
 categories:
 - Physics
diff --git a/source/know/concept/cauchy-principal-value/index.md b/source/know/concept/cauchy-principal-value/index.md
index fec0826..a2582f2 100644
--- a/source/know/concept/cauchy-principal-value/index.md
+++ b/source/know/concept/cauchy-principal-value/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Cauchy principal value"
+sort_title: "Cauchy principal value"
 date: 2021-11-01
 categories:
 - Mathematics
diff --git a/source/know/concept/cauchy-strain-tensor/index.md b/source/know/concept/cauchy-strain-tensor/index.md
index b5840e7..a628820 100644
--- a/source/know/concept/cauchy-strain-tensor/index.md
+++ b/source/know/concept/cauchy-strain-tensor/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Cauchy strain tensor"
+sort_title: "Cauchy strain tensor"
 date: 2021-03-31
 categories:
 - Physics
diff --git a/source/know/concept/cauchy-stress-tensor/index.md b/source/know/concept/cauchy-stress-tensor/index.md
index c56d997..1d9ad0d 100644
--- a/source/know/concept/cauchy-stress-tensor/index.md
+++ b/source/know/concept/cauchy-stress-tensor/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Cauchy stress tensor"
+sort_title: "Cauchy stress tensor"
 date: 2021-03-31
 categories:
 - Physics
diff --git a/source/know/concept/cavitation/index.md b/source/know/concept/cavitation/index.md
index 95822ae..346edc4 100644
--- a/source/know/concept/cavitation/index.md
+++ b/source/know/concept/cavitation/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Cavitation"
+sort_title: "Cavitation"
 date: 2021-04-09
 categories:
 - Physics
diff --git a/source/know/concept/central-limit-theorem/index.md b/source/know/concept/central-limit-theorem/index.md
index 126ff3b..0c08a6f 100644
--- a/source/know/concept/central-limit-theorem/index.md
+++ b/source/know/concept/central-limit-theorem/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Central limit theorem"
+sort_title: "Central limit theorem"
 date: 2021-03-09
 categories:
 - Statistics
diff --git a/source/know/concept/conditional-expectation/index.md b/source/know/concept/conditional-expectation/index.md
index c545cef..7b13a4a 100644
--- a/source/know/concept/conditional-expectation/index.md
+++ b/source/know/concept/conditional-expectation/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Conditional expectation"
+sort_title: "Conditional expectation"
 date: 2021-10-23
 categories:
 - Mathematics
diff --git a/source/know/concept/convolution-theorem/index.md b/source/know/concept/convolution-theorem/index.md
index d6c578b..d4655cf 100644
--- a/source/know/concept/convolution-theorem/index.md
+++ b/source/know/concept/convolution-theorem/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Convolution theorem"
+sort_title: "Convolution theorem"
 date: 2021-02-22
 categories:
 - Mathematics
@@ -29,7 +30,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-fourier"/>
 <label for="proof-fourier">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-fourier">Proof.</label>
 We expand the right-hand side of the theorem and
 rearrange the integrals:
@@ -81,7 +82,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-laplace"/>
 <label for="proof-laplace">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-laplace">Proof.</label>
 We expand the left-hand side.
 Note that the lower integration limit is 0 instead of $-\infty$,
diff --git a/source/know/concept/coulomb-logarithm/index.md b/source/know/concept/coulomb-logarithm/index.md
index 3bed159..d036aa6 100644
--- a/source/know/concept/coulomb-logarithm/index.md
+++ b/source/know/concept/coulomb-logarithm/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Coulomb logarithm"
+sort_title: "Coulomb logarithm"
 date: 2021-10-03
 categories:
 - Physics
diff --git a/source/know/concept/coupled-mode-theory/index.md b/source/know/concept/coupled-mode-theory/index.md
index acb4710..ecae1bb 100644
--- a/source/know/concept/coupled-mode-theory/index.md
+++ b/source/know/concept/coupled-mode-theory/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Coupled mode theory"
+sort_title: "Coupled mode theory"
 date: 2022-03-31
 categories:
 - Physics
diff --git a/source/know/concept/curvature/index.md b/source/know/concept/curvature/index.md
index 40bd106..bf8ae25 100644
--- a/source/know/concept/curvature/index.md
+++ b/source/know/concept/curvature/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Curvature"
+sort_title: "Curvature"
 date: 2021-03-07
 categories:
 - Mathematics
diff --git a/source/know/concept/curvilinear-coordinates/index.md b/source/know/concept/curvilinear-coordinates/index.md
index 9cae643..3012ca6 100644
--- a/source/know/concept/curvilinear-coordinates/index.md
+++ b/source/know/concept/curvilinear-coordinates/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Curvilinear coordinates"
+sort_title: "Curvilinear coordinates"
 date: 2021-03-03
 categories:
 - Mathematics
@@ -104,7 +105,7 @@ $$\begin{gathered}
 <div class="accordion">
 <input type="checkbox" id="proof-grad"/>
 <label for="proof-grad">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-grad">Proof.</label>
 For a direction $\dd{\ell}$, we know that
 $\idv{f}{\ell}$ is the component of $\nabla f$ in that direction:
@@ -146,7 +147,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-div"/>
 <label for="proof-div">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-div">Proof.</label>
 As preparation, we rewrite $\vb{V}$ as follows
 to introduce the scale factors:
@@ -265,7 +266,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-curl"/>
 <label for="proof-curl">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-curl">Proof.</label>
 The curl is found in a similar way as the divergence.
 We rewrite $\vb{V}$ like so:
diff --git a/source/know/concept/cylindrical-parabolic-coordinates/index.md b/source/know/concept/cylindrical-parabolic-coordinates/index.md
index f9d0475..76ff756 100644
--- a/source/know/concept/cylindrical-parabolic-coordinates/index.md
+++ b/source/know/concept/cylindrical-parabolic-coordinates/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Cylindrical parabolic coordinates"
+sort_title: "Cylindrical parabolic coordinates"
 date: 2021-03-04
 categories:
 - Mathematics
diff --git a/source/know/concept/cylindrical-polar-coordinates/index.md b/source/know/concept/cylindrical-polar-coordinates/index.md
index a91e53e..8673c0b 100644
--- a/source/know/concept/cylindrical-polar-coordinates/index.md
+++ b/source/know/concept/cylindrical-polar-coordinates/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Cylindrical polar coordinates"
+sort_title: "Cylindrical polar coordinates"
 date: 2021-07-26
 categories:
 - Mathematics
diff --git a/source/know/concept/debye-length/index.md b/source/know/concept/debye-length/index.md
index 9b87585..a42d137 100644
--- a/source/know/concept/debye-length/index.md
+++ b/source/know/concept/debye-length/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Debye length"
+sort_title: "Debye length"
 date: 2021-10-18
 categories:
 - Physics
diff --git a/source/know/concept/density-of-states/index.md b/source/know/concept/density-of-states/index.md
index 5b18537..60b81d5 100644
--- a/source/know/concept/density-of-states/index.md
+++ b/source/know/concept/density-of-states/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Density of states"
+sort_title: "Density of states"
 date: 2021-05-08
 categories:
 - Physics
diff --git a/source/know/concept/density-operator/index.md b/source/know/concept/density-operator/index.md
index ece712c..d2042ef 100644
--- a/source/know/concept/density-operator/index.md
+++ b/source/know/concept/density-operator/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Density operator"
+sort_title: "Density operator"
 date: 2021-03-03
 categories:
 - Physics
diff --git a/source/know/concept/detailed-balance/index.md b/source/know/concept/detailed-balance/index.md
index b7d5386..9745959 100644
--- a/source/know/concept/detailed-balance/index.md
+++ b/source/know/concept/detailed-balance/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Detailed balance"
+sort_title: "Detailed balance"
 date: 2021-11-27
 categories:
 - Physics
diff --git a/source/know/concept/deutsch-jozsa-algorithm/index.md b/source/know/concept/deutsch-jozsa-algorithm/index.md
index 080b290..c2bd1e6 100644
--- a/source/know/concept/deutsch-jozsa-algorithm/index.md
+++ b/source/know/concept/deutsch-jozsa-algorithm/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Deutsch-Jozsa algorithm"
+sort_title: "Deutsch-Jozsa algorithm"
 date: 2021-04-08
 categories:
 - Quantum information
diff --git a/source/know/concept/dielectric-function/index.md b/source/know/concept/dielectric-function/index.md
index 7bee0cf..30622f4 100644
--- a/source/know/concept/dielectric-function/index.md
+++ b/source/know/concept/dielectric-function/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Dielectric function"
+sort_title: "Dielectric function"
 date: 2022-01-24
 categories:
 - Physics
diff --git a/source/know/concept/diffie-hellman-key-exchange/index.md b/source/know/concept/diffie-hellman-key-exchange/index.md
index 0947e29..951d5f5 100644
--- a/source/know/concept/diffie-hellman-key-exchange/index.md
+++ b/source/know/concept/diffie-hellman-key-exchange/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Diffie-Hellman key exchange"
+sort_title: "Diffie-Hellman key exchange"
 date: 2021-03-06
 categories:
 - Cryptography
diff --git a/source/know/concept/dirac-delta-function/index.md b/source/know/concept/dirac-delta-function/index.md
index 63edd81..88a08cb 100644
--- a/source/know/concept/dirac-delta-function/index.md
+++ b/source/know/concept/dirac-delta-function/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Dirac delta function"
+sort_title: "Dirac delta function"
 date: 2021-02-22
 categories:
 - Mathematics
@@ -67,7 +68,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-scale"/>
 <label for="proof-scale">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-scale">Proof.</label>
 Because it is symmetric, $\delta(s x) = \delta(|s| x)$.
 Then by substituting $\sigma = |s| x$:
@@ -90,7 +91,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-dv1"/>
 <label for="proof-dv1">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-dv1">Proof.</label>
 Note which variable is used for the
 differentiation, and that $\delta'(x - \xi) = - \delta'(\xi - x)$:
diff --git a/source/know/concept/dirac-notation/index.md b/source/know/concept/dirac-notation/index.md
index 414b903..8861505 100644
--- a/source/know/concept/dirac-notation/index.md
+++ b/source/know/concept/dirac-notation/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Dirac notation"
+sort_title: "Dirac notation"
 date: 2021-02-22
 categories:
 - Quantum mechanics
diff --git a/source/know/concept/dispersive-broadening/index.md b/source/know/concept/dispersive-broadening/index.md
index 64c251a..816135a 100644
--- a/source/know/concept/dispersive-broadening/index.md
+++ b/source/know/concept/dispersive-broadening/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Dispersive broadening"
+sort_title: "Dispersive broadening"
 date: 2021-02-27
 categories:
 - Physics
diff --git a/source/know/concept/drude-model/index.md b/source/know/concept/drude-model/index.md
index 7f62ae5..28e6dc2 100644
--- a/source/know/concept/drude-model/index.md
+++ b/source/know/concept/drude-model/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Drude model"
+sort_title: "Drude model"
 date: 2021-09-23
 categories:
 - Physics
diff --git a/source/know/concept/dynkins-formula/index.md b/source/know/concept/dynkins-formula/index.md
index be7fa17..53da86f 100644
--- a/source/know/concept/dynkins-formula/index.md
+++ b/source/know/concept/dynkins-formula/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Dynkin's formula"
+sort_title: "Dynkin's formula"
 date: 2021-11-28
 categories:
 - Mathematics
diff --git a/source/know/concept/dyson-equation/index.md b/source/know/concept/dyson-equation/index.md
index 82020ad..962b64a 100644
--- a/source/know/concept/dyson-equation/index.md
+++ b/source/know/concept/dyson-equation/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Dyson equation"
+sort_title: "Dyson equation"
 date: 2021-11-01
 categories:
 - Physics
diff --git a/source/know/concept/ehrenfests-theorem/index.md b/source/know/concept/ehrenfests-theorem/index.md
index a2a676a..4d96989 100644
--- a/source/know/concept/ehrenfests-theorem/index.md
+++ b/source/know/concept/ehrenfests-theorem/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Ehrenfest's theorem"
+sort_title: "Ehrenfest's theorem"
 date: 2021-02-24
 categories:
 - Quantum mechanics
diff --git a/source/know/concept/einstein-coefficients/index.md b/source/know/concept/einstein-coefficients/index.md
index ff44888..27d6013 100644
--- a/source/know/concept/einstein-coefficients/index.md
+++ b/source/know/concept/einstein-coefficients/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Einstein coefficients"
+sort_title: "Einstein coefficients"
 date: 2021-07-11
 categories:
 - Physics
diff --git a/source/know/concept/elastic-collision/index.md b/source/know/concept/elastic-collision/index.md
index f3c4b7b..11c3115 100644
--- a/source/know/concept/elastic-collision/index.md
+++ b/source/know/concept/elastic-collision/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Elastic collision"
+sort_title: "Elastic collision"
 date: 2021-10-04
 categories:
 - Physics
diff --git a/source/know/concept/electric-dipole-approximation/index.md b/source/know/concept/electric-dipole-approximation/index.md
index c3e6dc0..66501e2 100644
--- a/source/know/concept/electric-dipole-approximation/index.md
+++ b/source/know/concept/electric-dipole-approximation/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Electric dipole approximation"
+sort_title: "Electric dipole approximation"
 date: 2021-09-14
 categories:
 - Physics
diff --git a/source/know/concept/electric-field/index.md b/source/know/concept/electric-field/index.md
index eef8bd5..38c1ff6 100644
--- a/source/know/concept/electric-field/index.md
+++ b/source/know/concept/electric-field/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Electric field"
+sort_title: "Electric field"
 date: 2021-07-12
 categories:
 - Physics
diff --git a/source/know/concept/electromagnetic-wave-equation/index.md b/source/know/concept/electromagnetic-wave-equation/index.md
index e6f6677..c4cd9eb 100644
--- a/source/know/concept/electromagnetic-wave-equation/index.md
+++ b/source/know/concept/electromagnetic-wave-equation/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Electromagnetic wave equation"
+sort_title: "Electromagnetic wave equation"
 date: 2021-09-09
 categories:
 - Physics
diff --git a/source/know/concept/equation-of-motion-theory/index.md b/source/know/concept/equation-of-motion-theory/index.md
index 81d4d46..f62fb56 100644
--- a/source/know/concept/equation-of-motion-theory/index.md
+++ b/source/know/concept/equation-of-motion-theory/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Equation-of-motion theory"
+sort_title: "Equation-of-motion theory"
 date: 2021-11-08
 categories:
 - Physics
@@ -65,7 +66,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-commH0"/>
 <label for="proof-commH0">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-commH0">Proof.</label>
 Using the commutator identity for $\comm{A B}{C}$,
 we decompose it like so:
diff --git a/source/know/concept/euler-bernoulli-law/index.md b/source/know/concept/euler-bernoulli-law/index.md
index 37212d2..c9dc7af 100644
--- a/source/know/concept/euler-bernoulli-law/index.md
+++ b/source/know/concept/euler-bernoulli-law/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Euler-Bernoulli law"
+sort_title: "Euler-Bernoulli law"
 date: 2021-06-03
 categories:
 - Physics
@@ -83,7 +84,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-field"/>
 <label for="proof-field">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-field">Proof.</label>
 By integrating the above strains $u_{ii} = \ipdv{u_i}{i}$,
 we get the components of $\va{u}$:
diff --git a/source/know/concept/euler-equations/index.md b/source/know/concept/euler-equations/index.md
index f89d577..ddaa27a 100644
--- a/source/know/concept/euler-equations/index.md
+++ b/source/know/concept/euler-equations/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Euler equations"
+sort_title: "Euler equations"
 date: 2021-03-31
 categories:
 - Physics
diff --git a/source/know/concept/fabry-perot-cavity/index.md b/source/know/concept/fabry-perot-cavity/index.md
index e2852d4..3f47c3e 100644
--- a/source/know/concept/fabry-perot-cavity/index.md
+++ b/source/know/concept/fabry-perot-cavity/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Fabry-Pérot cavity"
+sort_title: "Fabry-Perot cavity" # sic
 date: 2021-09-18
 categories:
 - Physics
diff --git a/source/know/concept/fermi-dirac-distribution/index.md b/source/know/concept/fermi-dirac-distribution/index.md
index 7fc4f0e..ea1f8b8 100644
--- a/source/know/concept/fermi-dirac-distribution/index.md
+++ b/source/know/concept/fermi-dirac-distribution/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Fermi-Dirac distribution"
+sort_title: "Fermi-Dirac distribution"
 date: 2021-07-11
 categories:
 - Physics
diff --git a/source/know/concept/fermis-golden-rule/index.md b/source/know/concept/fermis-golden-rule/index.md
index f64e9df..18fcfd8 100644
--- a/source/know/concept/fermis-golden-rule/index.md
+++ b/source/know/concept/fermis-golden-rule/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Fermi's golden rule"
+sort_title: "Fermi's golden rule"
 date: 2021-07-10
 categories:
 - Physics
diff --git a/source/know/concept/feynman-diagram/index.md b/source/know/concept/feynman-diagram/index.md
index 15410f7..d117562 100644
--- a/source/know/concept/feynman-diagram/index.md
+++ b/source/know/concept/feynman-diagram/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Feynman diagram"
+sort_title: "Feynman diagram"
 date: 2021-11-18
 categories:
 - Physics
diff --git a/source/know/concept/ficks-laws/index.md b/source/know/concept/ficks-laws/index.md
index 234b180..f978ef5 100644
--- a/source/know/concept/ficks-laws/index.md
+++ b/source/know/concept/ficks-laws/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Fick's laws"
+sort_title: "Fick's laws"
 date: 2021-09-05
 categories:
 - Physics
diff --git a/source/know/concept/fourier-transform/index.md b/source/know/concept/fourier-transform/index.md
index 32edb47..f8b5b2a 100644
--- a/source/know/concept/fourier-transform/index.md
+++ b/source/know/concept/fourier-transform/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Fourier transform"
+sort_title: "Fourier transform"
 date: 2021-02-22
 categories:
 - Mathematics
@@ -152,7 +153,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-constants-ND"/>
 <label for="proof-constants-ND">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-constants-ND">Proof.</label>
 The inverse FT of the forward FT of $f(\vb{x})$ must be equal to $f(\vb{x})$ again, so:
 
@@ -198,7 +199,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-laplacian"/>
 <label for="proof-laplacian">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-laplacian">Proof.</label>
 We insert $\nabla^2 f$ into the FT,
 decompose the exponential and the Laplacian,
diff --git a/source/know/concept/fredholm-alternative/index.md b/source/know/concept/fredholm-alternative/index.md
index c813fb4..5d53e79 100644
--- a/source/know/concept/fredholm-alternative/index.md
+++ b/source/know/concept/fredholm-alternative/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Fredholm alternative"
+sort_title: "Fredholm alternative"
 date: 2021-05-29
 categories:
 - Mathematics
diff --git a/source/know/concept/fundamental-solution/index.md b/source/know/concept/fundamental-solution/index.md
index f5a51d5..e8ffda6 100644
--- a/source/know/concept/fundamental-solution/index.md
+++ b/source/know/concept/fundamental-solution/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Fundamental solution"
+sort_title: "Fundamental solution"
 date: 2021-11-02
 categories:
 - Mathematics
@@ -44,7 +45,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-solution"/>
 <label for="proof-solution">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-solution">Proof.</label>
 $\hat{L}$ only acts on $x$, so $x' \in ]a, b[$ is simply a parameter,
 meaning we are free to multiply the definition of $G$
@@ -119,7 +120,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-reciprocity"/>
 <label for="proof-reciprocity">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-reciprocity">Proof.</label>
 Consider two parameters $x_1'$ and $x_2'$.
 The self-adjointness of $\hat{L}$ means that:
diff --git a/source/know/concept/fundamental-thermodynamic-relation/index.md b/source/know/concept/fundamental-thermodynamic-relation/index.md
index a251fcd..392e0b3 100644
--- a/source/know/concept/fundamental-thermodynamic-relation/index.md
+++ b/source/know/concept/fundamental-thermodynamic-relation/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Fundamental thermodynamic relation"
+sort_title: "Fundamental thermodynamic relation"
 date: 2021-07-07
 categories:
 - Physics
diff --git a/source/know/concept/ghz-paradox/index.md b/source/know/concept/ghz-paradox/index.md
index 5cd2d19..e1129d4 100644
--- a/source/know/concept/ghz-paradox/index.md
+++ b/source/know/concept/ghz-paradox/index.md
@@ -1,5 +1,6 @@
 ---
 title: "GHZ paradox"
+sort_title: "GHZ paradox"
 date: 2021-03-29
 categories:
 - Physics
diff --git a/source/know/concept/grad-shafranov-equation/index.md b/source/know/concept/grad-shafranov-equation/index.md
index 8bef8af..35d23f4 100644
--- a/source/know/concept/grad-shafranov-equation/index.md
+++ b/source/know/concept/grad-shafranov-equation/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Grad-Shafranov equation"
+sort_title: "Grad-Shafranov equation"
 date: 2022-03-06
 categories:
 - Physics
diff --git a/source/know/concept/gram-schmidt-method/index.md b/source/know/concept/gram-schmidt-method/index.md
index 483dd71..374b169 100644
--- a/source/know/concept/gram-schmidt-method/index.md
+++ b/source/know/concept/gram-schmidt-method/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Gram-Schmidt method"
+sort_title: "Gram-Schmidt method"
 date: 2021-02-22
 categories:
 - Mathematics
diff --git a/source/know/concept/grand-canonical-ensemble/index.md b/source/know/concept/grand-canonical-ensemble/index.md
index 85bf90a..4f66fd9 100644
--- a/source/know/concept/grand-canonical-ensemble/index.md
+++ b/source/know/concept/grand-canonical-ensemble/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Grand canonical ensemble"
+sort_title: "Grand canonical ensemble"
 date: 2021-07-11
 categories:
 - Physics
diff --git a/source/know/concept/greens-functions/index.md b/source/know/concept/greens-functions/index.md
index 48f1e76..0e53945 100644
--- a/source/know/concept/greens-functions/index.md
+++ b/source/know/concept/greens-functions/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Green's functions"
+sort_title: "Green's functions"
 date: 2021-11-03
 categories:
 - Physics
diff --git a/source/know/concept/gronwall-bellman-inequality/index.md b/source/know/concept/gronwall-bellman-inequality/index.md
index 5fd9f38..417b033 100644
--- a/source/know/concept/gronwall-bellman-inequality/index.md
+++ b/source/know/concept/gronwall-bellman-inequality/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Grönwall-Bellman inequality"
+sort_title: "Gronwall-Bellman inequality" # sic
 date: 2021-11-07
 categories:
 - Mathematics
@@ -28,7 +29,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-original"/>
 <label for="proof-original">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-original">Proof.</label>
 We define $w(t)$ to equal the upper bounds above
 on both $w'(t)$ and $w(t)$ itself:
@@ -86,7 +87,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-integral"/>
 <label for="proof-integral">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-integral">Proof.</label>
 We start by defining $w(t)$ as follows,
 which will act as shorthand:
@@ -153,7 +154,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-special"/>
 <label for="proof-special">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-special">Proof.</label>
 Starting from the "ordinary" Grönwall-Bellman inequality,
 the fact that $\alpha(t)$ is non-decreasing tells us that
diff --git a/source/know/concept/guiding-center-theory/index.md b/source/know/concept/guiding-center-theory/index.md
index d429a50..6de54fa 100644
--- a/source/know/concept/guiding-center-theory/index.md
+++ b/source/know/concept/guiding-center-theory/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Guiding center theory"
+sort_title: "Guiding center theory"
 date: 2021-09-21
 categories:
 - Physics
@@ -333,7 +334,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-nonuniform-B-curvature"/>
 <label for="proof-nonuniform-B-curvature">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-nonuniform-B-curvature">Proof.</label>
 Assuming that $\vu{b}$ does not explicitly depend on time,
 i.e. $\ipdv{\vu{b}}{t} = 0$,
diff --git a/source/know/concept/hagen-poiseuille-equation/index.md b/source/know/concept/hagen-poiseuille-equation/index.md
index fc2975a..d59ee9a 100644
--- a/source/know/concept/hagen-poiseuille-equation/index.md
+++ b/source/know/concept/hagen-poiseuille-equation/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Hagen-Poiseuille equation"
+sort_title: "Hagen-Poiseuille equation"
 date: 2021-04-13
 categories:
 - Physics
diff --git a/source/know/concept/hamiltonian-mechanics/index.md b/source/know/concept/hamiltonian-mechanics/index.md
index 610f8bd..466a78f 100644
--- a/source/know/concept/hamiltonian-mechanics/index.md
+++ b/source/know/concept/hamiltonian-mechanics/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Hamiltonian mechanics"
+sort_title: "Hamiltonian mechanics"
 date: 2021-07-03
 categories:
 - Physics
@@ -107,7 +108,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-canoneq"/>
 <label for="proof-canoneq">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-canoneq">Proof.</label>
 For the first equation,
 we differentiate $H$ with respect to $q_n$,
@@ -176,7 +177,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-diff-t"/>
 <label for="proof-diff-t">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-diff-t">Proof.</label>
 We differentiate via the multivariate chain rule,
 insert the canonical equations,
diff --git a/source/know/concept/harmonic-oscillator/index.md b/source/know/concept/harmonic-oscillator/index.md
index f17203b..6729dc2 100644
--- a/source/know/concept/harmonic-oscillator/index.md
+++ b/source/know/concept/harmonic-oscillator/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Harmonic oscillator"
+sort_title: "Harmonic oscillator"
 date: 2021-06-02
 categories:
 - Physics
diff --git a/source/know/concept/heaviside-step-function/index.md b/source/know/concept/heaviside-step-function/index.md
index 30b5f5d..1933037 100644
--- a/source/know/concept/heaviside-step-function/index.md
+++ b/source/know/concept/heaviside-step-function/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Heaviside step function"
+sort_title: "Heaviside step function"
 date: 2021-02-25
 categories:
 - Mathematics
@@ -59,7 +60,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-fourier"/>
 <label for="proof-fourier">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-fourier">Proof.</label>
 In this case, it is easiest to use $\Theta(0) = 1/2$,
 such that the Heaviside step function can be expressed
diff --git a/source/know/concept/heisenberg-picture/index.md b/source/know/concept/heisenberg-picture/index.md
index b6c49d7..59ed2da 100644
--- a/source/know/concept/heisenberg-picture/index.md
+++ b/source/know/concept/heisenberg-picture/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Heisenberg picture"
+sort_title: "Heisenberg picture"
 date: 2021-02-24
 categories:
 - Quantum mechanics
diff --git a/source/know/concept/hellmann-feynman-theorem/index.md b/source/know/concept/hellmann-feynman-theorem/index.md
index 6b458db..9ffff34 100644
--- a/source/know/concept/hellmann-feynman-theorem/index.md
+++ b/source/know/concept/hellmann-feynman-theorem/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Hellmann-Feynman theorem"
+sort_title: "Hellmann-Feynman theorem"
 date: 2021-11-29
 categories:
 - Physics
diff --git a/source/know/concept/hermite-polynomials/index.md b/source/know/concept/hermite-polynomials/index.md
index 17e61df..ce34030 100644
--- a/source/know/concept/hermite-polynomials/index.md
+++ b/source/know/concept/hermite-polynomials/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Hermite polynomials"
+sort_title: "Hermite polynomials"
 date: 2021-09-08
 categories:
 - Mathematics
diff --git a/source/know/concept/hilbert-space/index.md b/source/know/concept/hilbert-space/index.md
index d2b9770..ef55d2b 100644
--- a/source/know/concept/hilbert-space/index.md
+++ b/source/know/concept/hilbert-space/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Hilbert space"
+sort_title: "Hilbert space"
 date: 2021-02-22
 categories:
 - Mathematics
diff --git a/source/know/concept/holomorphic-function/index.md b/source/know/concept/holomorphic-function/index.md
index 17bd5a6..e22799c 100644
--- a/source/know/concept/holomorphic-function/index.md
+++ b/source/know/concept/holomorphic-function/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Holomorphic function"
+sort_title: "Holomorphic function"
 date: 2021-02-25
 categories:
 - Mathematics
@@ -75,7 +76,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-int-theorem"/>
 <label for="proof-int-theorem">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-int-theorem">Proof.</label>
 Just like before, we decompose $f(z)$ into its real and imaginary parts:
 
@@ -112,7 +113,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-int-formula"/>
 <label for="proof-int-formula">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-int-formula">Proof.</label>
 Thanks to the integral theorem, we know that the shape and size
 of $C$ is irrelevant. Therefore we choose it to be a circle with radius $r$,
@@ -150,7 +151,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-diff-formula"/>
 <label for="proof-diff-formula">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-diff-formula">Proof.</label>
 By definition, the first derivative $f'(z)$ of a
 holomorphic function exists and is:
diff --git a/source/know/concept/hookes-law/index.md b/source/know/concept/hookes-law/index.md
index 57ab27f..87e04de 100644
--- a/source/know/concept/hookes-law/index.md
+++ b/source/know/concept/hookes-law/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Hooke's law"
+sort_title: "Hooke's law"
 date: 2021-04-02
 categories:
 - Physics
diff --git a/source/know/concept/hydrostatic-pressure/index.md b/source/know/concept/hydrostatic-pressure/index.md
index 4add09e..2e55246 100644
--- a/source/know/concept/hydrostatic-pressure/index.md
+++ b/source/know/concept/hydrostatic-pressure/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Hydrostatic pressure"
+sort_title: "Hydrostatic pressure"
 date: 2021-03-12
 categories:
 - Physics
diff --git a/source/know/concept/imaginary-time/index.md b/source/know/concept/imaginary-time/index.md
index 5dc9264..1dbdf11 100644
--- a/source/know/concept/imaginary-time/index.md
+++ b/source/know/concept/imaginary-time/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Imaginary time"
+sort_title: "Imaginary time"
 date: 2021-11-11
 categories:
 - Physics
diff --git a/source/know/concept/impulse-response/index.md b/source/know/concept/impulse-response/index.md
index 65849aa..533580d 100644
--- a/source/know/concept/impulse-response/index.md
+++ b/source/know/concept/impulse-response/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Impulse response"
+sort_title: "Impulse response"
 date: 2021-03-09
 categories:
 - Mathematics
@@ -32,7 +33,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-main"/>
 <label for="proof-main">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-main">Proof.</label>
 Starting from the definition of $u_p(t)$,
 we shift the argument by some constant $\tau$,
diff --git a/source/know/concept/index.md b/source/know/concept/index.md
index 69b8ca9..68b5f8c 100644
--- a/source/know/concept/index.md
+++ b/source/know/concept/index.md
@@ -6,28 +6,11 @@ layout: "default"
 
 # List of concepts
 
-{% assign by_letter = site.pages
+This is an alphabetical list of the concepts in this knowledge base.
+
+{% assign pages_by_letter = site.pages
   | where_exp: "item", "item.layout == 'concept'"
-  | group_by_exp: "item", "item.title | truncate: 1, ''"
+  | group_by_exp: "item", "item.sort_title | truncate: 1, ''"
   | sort: "name"
 %}
-
-This is an alphabetical list of the concepts in this knowledge base.
-
-<div style="text-align: center;">
-&hyphen; 
-{% for letter in by_letter %}
-<a href="#{{ letter.name }}">{{ letter.name }}</a>
-&hyphen; 
-{% endfor %}
-</div>
-
-{% for letter in by_letter %}
-<h2 id="{{ letter.name }}">{{ letter.name }}</h2>
-<ul>
-  {% assign items = letter.items | sort: "title" %}
-  {% for item in items %}
-  <li><a href="{{ item.url }}">{{ item.title }}</a></li>
-  {% endfor %}
-</ul>
-{% endfor %}
+{% include alphlist.html pages_by_letter = pages_by_letter %}
diff --git a/source/know/concept/interaction-picture/index.md b/source/know/concept/interaction-picture/index.md
index 3912b46..05f3ad0 100644
--- a/source/know/concept/interaction-picture/index.md
+++ b/source/know/concept/interaction-picture/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Interaction picture"
+sort_title: "Interaction picture"
 date: 2021-09-13
 categories:
 - Physics
diff --git a/source/know/concept/ion-sound-wave/index.md b/source/know/concept/ion-sound-wave/index.md
index 48a727d..622605c 100644
--- a/source/know/concept/ion-sound-wave/index.md
+++ b/source/know/concept/ion-sound-wave/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Ion sound wave"
+sort_title: "Ion sound wave"
 date: 2021-10-31
 categories:
 - Physics
diff --git a/source/know/concept/ito-integral/index.md b/source/know/concept/ito-integral/index.md
index da3c706..3f17a9a 100644
--- a/source/know/concept/ito-integral/index.md
+++ b/source/know/concept/ito-integral/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Itō integral"
+sort_title: "Ito integral" # sic
 date: 2021-11-06
 categories:
 - Mathematics
diff --git a/source/know/concept/ito-process/index.md b/source/know/concept/ito-process/index.md
index 4379215..b82835d 100644
--- a/source/know/concept/ito-process/index.md
+++ b/source/know/concept/ito-process/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Itō process"
+sort_title: "Ito process" # sic
 date: 2021-11-06
 categories:
 - Mathematics
@@ -85,7 +86,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-lemma"/>
 <label for="proof-lemma">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-lemma">Proof.</label>
 We start by applying the classical chain rule,
 but we go to second order in $x$.
diff --git a/source/know/concept/jellium/index.md b/source/know/concept/jellium/index.md
index 6e395b4..c951fd7 100644
--- a/source/know/concept/jellium/index.md
+++ b/source/know/concept/jellium/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Jellium"
+sort_title: "Jellium"
 date: 2021-11-23
 categories:
 - Physics
diff --git a/source/know/concept/kolmogorov-equations/index.md b/source/know/concept/kolmogorov-equations/index.md
index a6579b2..47820ee 100644
--- a/source/know/concept/kolmogorov-equations/index.md
+++ b/source/know/concept/kolmogorov-equations/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Kolmogorov equations"
+sort_title: "Kolmogorov equations"
 date: 2021-11-14
 categories:
 - Mathematics
diff --git a/source/know/concept/kramers-kronig-relations/index.md b/source/know/concept/kramers-kronig-relations/index.md
index f66ab0a..bb9b08c 100644
--- a/source/know/concept/kramers-kronig-relations/index.md
+++ b/source/know/concept/kramers-kronig-relations/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Kramers-Kronig relations"
+sort_title: "Kramers-Kronig relations"
 date: 2021-02-25
 categories:
 - Mathematics
diff --git a/source/know/concept/kubo-formula/index.md b/source/know/concept/kubo-formula/index.md
index 40d90e1..80309c5 100644
--- a/source/know/concept/kubo-formula/index.md
+++ b/source/know/concept/kubo-formula/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Kubo formula"
+sort_title: "Kubo formula"
 date: 2021-09-23
 categories:
 - Physics
diff --git a/source/know/concept/lagrange-multiplier/index.md b/source/know/concept/lagrange-multiplier/index.md
index 4c01aed..9761e75 100644
--- a/source/know/concept/lagrange-multiplier/index.md
+++ b/source/know/concept/lagrange-multiplier/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Lagrange multiplier"
+sort_title: "Lagrange multiplier"
 date: 2021-03-02
 categories:
 - Mathematics
diff --git a/source/know/concept/lagrangian-mechanics/index.md b/source/know/concept/lagrangian-mechanics/index.md
index fd26121..7b520a2 100644
--- a/source/know/concept/lagrangian-mechanics/index.md
+++ b/source/know/concept/lagrangian-mechanics/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Lagrangian mechanics"
+sort_title: "Lagrangian mechanics"
 date: 2021-07-01
 categories:
 - Physics
diff --git a/source/know/concept/laguerre-polynomials/index.md b/source/know/concept/laguerre-polynomials/index.md
index 130dff2..fd3deb6 100644
--- a/source/know/concept/laguerre-polynomials/index.md
+++ b/source/know/concept/laguerre-polynomials/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Laguerre polynomials"
+sort_title: "Laguerre polynomials"
 date: 2021-09-08
 categories:
 - Mathematics
diff --git a/source/know/concept/landau-quantization/index.md b/source/know/concept/landau-quantization/index.md
index e28b396..82ea86e 100644
--- a/source/know/concept/landau-quantization/index.md
+++ b/source/know/concept/landau-quantization/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Landau quantization"
+sort_title: "Landau quantization"
 date: 2021-07-01
 categories:
 - Physics
diff --git a/source/know/concept/langmuir-waves/index.md b/source/know/concept/langmuir-waves/index.md
index b5f3fd4..0b7f2d7 100644
--- a/source/know/concept/langmuir-waves/index.md
+++ b/source/know/concept/langmuir-waves/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Langmuir waves"
+sort_title: "Langmuir waves"
 date: 2021-10-30
 categories:
 - Physics
diff --git a/source/know/concept/laplace-transform/index.md b/source/know/concept/laplace-transform/index.md
index 94ea3fc..5b834c3 100644
--- a/source/know/concept/laplace-transform/index.md
+++ b/source/know/concept/laplace-transform/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Laplace transform"
+sort_title: "Laplace transform"
 date: 2021-07-02
 categories:
 - Mathematics
@@ -57,7 +58,7 @@ $$\begin{aligned}
 <div class="accordion">
 <input type="checkbox" id="proof-dv-s"/>
 <label for="proof-dv-s">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-dv-s">Proof.</label>
 The exponential $\exp(- s t)$ is the only thing that depends on $s$ here:
 
@@ -99,7 +100,7 @@ $- f''(0) - s f'(0) - s^2 f(0) + s^3 \tilde{f}(s)$.
 <div class="accordion">
 <input type="checkbox" id="proof-dv-t"/>
 <label for="proof-dv-t">Proof</label>
-<div class="hidden">
+<div class="hidden" markdown="1">
 <label for="proof-dv-t">Proof.</label>
 We integrate by parts and use the fact that $\lim_{x \to \infty} \exp(-x) = 0$:
 
diff --git a/source/know/concept/larmor-precession/index.md b/source/know/concept/larmor-precession/index.md
index ff80619..6b101e0 100644
--- a/source/know/concept/larmor-precession/index.md
+++ b/source/know/concept/larmor-precession/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Larmor precession"
+sort_title: "Larmor precession"
 date: 2021-07-02
 categories:
 - Physics
diff --git a/source/know/concept/laser-rate-equations/index.md b/source/know/concept/laser-rate-equations/index.md
index dec7e4b..939a1a0 100644
--- a/source/know/concept/laser-rate-equations/index.md
+++ b/source/know/concept/laser-rate-equations/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Laser rate equations"
+sort_title: "Laser rate equations"
 date: 2022-03-16
 categories:
 - Physics
diff --git a/source/know/concept/laws-of-thermodynamics/index.md b/source/know/concept/laws-of-thermodynamics/index.md
index 2d7af9e..7758446 100644
--- a/source/know/concept/laws-of-thermodynamics/index.md
+++ b/source/know/concept/laws-of-thermodynamics/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Laws of thermodynamics"
+sort_title: "Laws of thermodynamics"
 date: 2021-07-07
 categories:
 - Physics
diff --git a/source/know/concept/lawson-criterion/index.md b/source/know/concept/lawson-criterion/index.md
index c1848dc..ff9594b 100644
--- a/source/know/concept/lawson-criterion/index.md
+++ b/source/know/concept/lawson-criterion/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Lawson criterion"
+sort_title: "Lawson criterion"
 date: 2021-10-06
 categories:
 - Physics
diff --git a/source/know/concept/legendre-polynomials/index.md b/source/know/concept/legendre-polynomials/index.md
index 338b23f..74543a3 100644
--- a/source/know/concept/legendre-polynomials/index.md
+++ b/source/know/concept/legendre-polynomials/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Legendre polynomials"
+sort_title: "Legendre polynomials"
 date