diff --git a/school/di-ma/uebung/04/04_3.tex b/school/di-ma/uebung/04/04_3.tex
index 2f7b40a..2421c98 100644
--- a/school/di-ma/uebung/04/04_3.tex
+++ b/school/di-ma/uebung/04/04_3.tex
@@ -72,12 +72,12 @@
         \\
         Inzidenz-Matrix:\\
         \begin{tabular}{c|ccccccc}
-            1 & 1 & 1 & 0 & 0 & 0 & 0 & 0 \\
-            2 & 1 & 0 & 1 & 0 & 0 & 0 & 0 \\
-            3 & 0 & 1 & 1 & 1 & 0 & 0 & 0 \\
-            4 & 0 & 0 & 0 & 1 & 1 & 0 & 1 \\
+            1 & -1 & -1 & 0 & 0 & 0 & 0 & 0 \\
+            2 & 1 & 0 & -1 & 0 & 0 & 0 & 0 \\
+            3 & 0 & 1 & 1 & -1 & 0 & 0 & 0 \\
+            4 & 0 & 0 & 0 & 1 & -1 & 0 & 1 \\
             5 & 0 & 0 & 0 & 0 & 1 & 1 & 0 \\
-            6 & 0 & 0 & 0 & 0 & 0 & 1 & 1 \\
+            6 & 0 & 0 & 0 & 0 & 0 & 1 & -1 \\
         \end{tabular}
 
     \item \begin{tikzpicture}