Various improvements to knowledge base

1 files changed, 4 insertions, 4 deletions

diff --git a/latex/know/concept/wentzel-kramers-brillouin-approximation/source.md b/latex/know/concept/wentzel-kramers-brillouin-approximation/source.md
index a50302c..79f344a 100644
--- a/latex/know/concept/wentzel-kramers-brillouin-approximation/source.md
+++ b/latex/know/concept/wentzel-kramers-brillouin-approximation/source.md
@@ -3,10 +3,10 @@
 
 # Wentzel-Kramers-Brillouin approximation
 
-In quantum mechanics, the *Wentzel-Kramers-Brillouin* or simply the *WKB
-approximation* is a method to approximate the wave function $\psi(x)$ of
+In quantum mechanics, the **Wentzel-Kramers-Brillouin** or simply the **WKB
+approximation** is a method to approximate the wave function $\psi(x)$ of
 the one-dimensional time-independent Schrödinger equation. It is an example
-of a *semiclassical approximation*, because it tries to find a
+of a **semiclassical approximation**, because it tries to find a
 balance between classical and quantum physics.
 
 In classical mechanics, a particle travelling in a potential $V(x)$
@@ -164,7 +164,7 @@ $$\begin{aligned}
 
 What if $E < V$? In classical mechanics, this is not allowed; a ball
 cannot simply go through a potential bump without the necessary energy.
-However, in quantum mechanics, particles can *tunnel* through barriers.
+However, in quantum mechanics, particles can **tunnel** through barriers.
 
 Conveniently, all we need to change for the WKB approximation is to let
 the momentum take imaginary values: