Expand knowledge base

1 files changed, 3 insertions, 2 deletions

diff --git a/content/know/concept/dyson-equation/index.pdc b/content/know/concept/dyson-equation/index.pdc
index 7b94124..be93379 100644
--- a/content/know/concept/dyson-equation/index.pdc
+++ b/content/know/concept/dyson-equation/index.pdc
@@ -21,7 +21,8 @@ $$\begin{aligned}
     = \hat{H}_0(\vb{r}) \: \Psi_0(\vb{r}, t)
 \end{aligned}$$
 
-By definition, this equation's *fundamental solution*
+By definition, this equation's
+[fundamental solution](/know/concept/fundamental-solution/)
 $G_0(\vb{r}, t; \vb{r}', t')$ satisfies the following:
 
 $$\begin{aligned}
@@ -142,7 +143,7 @@ and integrate over $G$'s second argument pair:
 
 $$\begin{aligned}
     \iint \big( \hat{G}{}_0^{-1} \!-\! \hat{H}_1 \big) G(\vb{r}', t') \: f(\vb{r}', t') \dd{\vb{r}'} \dd{t'}
-    = \iint^\infty \delta(\vb{r} \!-\! \vb{r}') \: \delta(t \!-\! t') \: f(\vb{r}, t) \dd{\vb{r}'} \dd{t'}
+    = \iint \delta(\vb{r} \!-\! \vb{r}') \: \delta(t \!-\! t') \: f(\vb{r}', t') \dd{\vb{r}'} \dd{t'}
     = f
 \end{aligned}$$