diff --git a/00 Inbox/29612838 - Lecture - 21_04.md b/00 Inbox/29612838 - Lecture - 21_04.md
index e203f0a..09436d5 100644
--- a/00 Inbox/29612838 - Lecture - 21_04.md	
+++ b/00 Inbox/29612838 - Lecture - 21_04.md	
@@ -16,3 +16,12 @@ tags:
 ---
 
 ## 📝 Content
+
+## Komplexer Momentanwert 
+
+$i(t) = hat(i) e^(j(omega t + phi)) = hat(i) cos(omega t + phi) + j hat(i) sin(omega t + phi)$
+=> $i(t) = "Im"{i(t)}$ 
+
+## Komplexe Kontenregel
+$sum_"Knoten" "Im"{underline(i)(t)} = 0$ 
+=> $"Im" { sum_"Knoten" underline(i)(t) } = 0$