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Questions about objects such as functions, algorithms or data structures that are expressed using "smaller" instances of themselves.

1 vote

Recursive set for a string

How about $$ v \in \Sigma \Longrightarrow v \in P $$ and $$v \in P \land e \in \Sigma \Longrightarrow eve \in P $$ so $$ eve \in P \land l \in \Sigma \Longrightarrow \boxed{level \in P}$$
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