\(X \bigtriangleup Y = \emptyset \iff (X \cup Y)\setminus (X\cap Y) =\emptyset\iff\)
\( X \cup Y \subseteq X\cap Y \iff (X\subseteq X\cap Y) \land (Y\subseteq X\cap Y) \iff\)
\( (X\subseteq Y) \land (Y\subseteq X) \iff X=Y\)
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─ werwohntinderananasganztiefim 08.10.2020 um 16:40