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diff --git a/ana7.tex b/ana7.tex
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--- a/ana7.tex
+++ b/ana7.tex
@@ -172,7 +172,7 @@ Weitere Begriffe und Eigenschaften
             (Qx, Qy)_2 &= (x, \overline{Q}^TQ y)_2 = (x,y)_2\\
             \norm{Qx}_2^2 &= (Qx, Qx)_2 = (x,x)_2 = \norm{x}_2^2\\
             \norm{Q}_2 &= \sup\limits_{\norm{x}_2 =1} \norm{Qx}_2 = \sup\limits_{\norm{x}_2 =1} \norm{x}_2 = 1\\
-            \norm{Q^{-1}}_2 &= \sup\limits_{\norm{x}_2 =1} \norm{Q^{-1}x}_2 = \sup\limits_{\norm{x}_2 =1} \norm{\overline{Q}Q^{-1}x}_2 = \sup\limits_{\norm{x}_2 =1} \norm{x}_2 = 1 
+            \norm{Q^{-1}}_2 &= \sup\limits_{\norm{x}_2 =1} \norm{Q^{-1}x}_2 = \sup\limits_{\norm{x}_2 =1} \norm{QQ^{-1}x}_2 = \sup\limits_{\norm{x}_2 =1} \norm{x}_2 = 1 
         \end{align*}
     \end{enumerate}
 \end{proof}
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