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319 B
1 lines
319 B
\item \lect In the context of \textit{Natural Deduction} in \textit{Predicate Logic}, what does it mean, if a variable is \textit{fresh}? Explain, why you need \textit{fresh variables} for certain proofs, for which proofs it is necessary to introduce \textit{fresh variables} and how they differ from other variables.
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