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theorem Set.eq_empty_iff_forall_notMem

theorem Set.eq_empty_iff_forall_notMem
: ∀ {α : Type u} {s : Set α}, s = ∅ ↔ ∀ (x : α), ¬x ∈ s

Published by @sam ·

View source in zpg9xh52

Definitional, with no premises to accept.