Show that there is a function $f : P(\Bbb{N} ) \to \Bbb{N}$ ,( $P(\Bbb{N})$ is power set) with this condition that for $A \in P(\Bbb{N})- \{\emptyset \}$ , $f(A) \in A$ , is there function with this condition and $\Bbb{Q} , \Bbb{Z} ,\Bbb{R} $.
2026-04-12 03:00:33.1775962833
There is a function with this condition...
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