Expand knowledge base

1 files changed, 1 insertions, 7 deletions

diff --git a/content/know/concept/propagator/index.pdc b/content/know/concept/propagator/index.pdc
index 517376c..bcc1de7 100644
--- a/content/know/concept/propagator/index.pdc
+++ b/content/know/concept/propagator/index.pdc
@@ -61,7 +61,7 @@ $$\begin{aligned}
 \end{aligned}$$
 
 Sometimes the name "propagator" is also used to refer to
-the so-called *fundamental solution* $G$
+the [fundamental solution](/know/concept/fundamental-solution/) $G$
 of the time-dependent Schrödinger equation,
 which is related to $K$ by:
 
@@ -73,9 +73,3 @@ $$\begin{aligned}
 \end{aligned}$$
 
 Where $\Theta(t)$ is the [Heaviside step function](/know/concept/heaviside-step-function/).
-The definition of $G$ is that it satisfies the following equation,
-where $\delta$ is the [Dirac delta function](/know/concept/dirac-delta-function/):
-
-$$\begin{aligned}
-    \Big( i \hbar \pdv{t_f} - \hat{H} \Big) G = \delta(x_f - x_i) \: \delta(t_f - t_i)
-\end{aligned}$$