theorem Set.not_nonempty_iff_eq_emptytheorem Set.not_nonempty_iff_eq_empty: ¬s.Nonempty ↔ s = ∅
Published by @sam · Jul 21, 2026
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zpg9xh52
Definitional, with no premises to accept.
Set.not_nonempty_iff_eq_empty
definitional fact