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\begin{definition}\label{D1_1_02}Ist $x$ \textbf{ein} Element einer beliebigen Menge $A$ so schreibt man dafür kurz $x\in A$. Ist $x$ dagegen \textbf{kein} Element der Menge $A$, so schreibt man dafür kurz $x\notin A$.
\end{definition}