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authorAdrian Kummerlaender2016-11-06 18:50:35 +0100
committerAdrian Kummerlaender2016-11-06 18:50:35 +0100
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Add section on De Morgan's laws
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+\section*{Nützliches aus der Mengenlehre}
+
+\subsection*{De Morgansche Regeln}
+
+Sei $\mathcal{B}$ ein Mengensystem.
+
+$$\left(\bigcup_{B\in \mathcal{B}} B \right)^c = \bigcap_{B\in \mathcal{B}} B^c \hspace*{8mm} \left(\bigcap_{B\in \mathcal{B}} \right)^c = \bigcup_{B\in \mathcal{B}} B^c$$
+
\section*{$\sigma$-Algebren}
Ein Mengensystem $\mathcal{A} \subseteq \mathcal{P}(X)$ ist $\sigma$-Algebra auf der nichtleeren Menge $X$ gdw.: