DOC

doc/discretization.md

@@ -194,6 +194,13 @@ We can also calculate the matrix current $`j\mapsto{}i`$ between neighboring cel
     U_{ij}
     +
     T^a U_{ij}\xi
+    \,,
+    \;
+    U_{ji}
+    \mapsto
+    U_{ji}
+    -
+    U_{ji} T^a \xi
   ]\rvert_{\xi=0}
 ```
 where $`T^a`$ is an appropriate matrix generator, and the transformation