fix double fullstop and add support for more relation symbols in salign
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@@ -15,7 +15,7 @@
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\begin{proof}
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Sei $x \in \mathbb{K}^{n}$. Dann ist
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\begin{salign}
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\begin{salign*}
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\Vert (\mathbb{I} + B) x \Vert
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&= \Vert x + B x\Vert \\
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&\stackrel{\text{Dreiecksungl.}}{\ge } \Vert x \Vert - \Vert Bx \Vert \\
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@@ -33,7 +33,7 @@
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- \Vert B (\mathbb{I} + B)^{-1} \Vert \\
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&\ge \Vert (\mathbb{I} + B)^{-1} \Vert - \Vert B \Vert \cdot \Vert (\mathbb{I} + B)^{-1} \Vert \\
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&= (1 - \Vert B \Vert) \Vert (\mathbb{I} + B)^{-1} \Vert
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.\end{salign}
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.\end{salign*}
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Damit folgt die Behauptung.
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\end{proof}
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