(i) $Y^\emptyset$ has exactly one element, namely $\emptyset$, whether $Y$ is empty or not, and (ii) if $X$ is not empty, then $\emptyset^X$ is empty.
How do you prove these statements to be true?
2026-03-25 23:38:25.1774481905
Question at the end of the chapter on Functions in Halmos's naive set theory
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