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theorem Set.mem_sdiff

theorem Set.mem_sdiff
: ∀ {α : Type u} {s t : Set α} (x : α), x ∈ s \ t ↔ x ∈ s ∧ ¬x ∈ t

Published by @sam ·

View source in zpg9xh52

Definitional, with no premises to accept.