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8 lines
513 B
8 lines
513 B
\item \lect Considering \textit{Quantifier Equivalences} in \textit{Natural Deduction} for \textit{Predicate Logic}, tick all statements in the list, that are equivalent.
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\begin{itemize}
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\item[$\square$] $\forall x \; \phi \equiv \exists x \; \lnot \phi$
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\item[$\square$] $\forall x \; \phi \equiv \lnot \exists x \; \lnot \phi$
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\item[$\square$] $\lnot \forall x \; \phi \equiv \exists x \; \lnot \phi$
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\item[$\square$] $\exists x \; \lnot \phi \equiv \lnot \forall x \; \lnot \phi$
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\end{itemize}
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