theorem Set.mem_sdifftheorem Set.mem_sdiff: ∀ {α : Type u} {s t : Set α} (x : α), x ∈ s \ t ↔ x ∈ s ∧ ¬x ∈ t
Published by @sam · Jul 21, 2026
View source in zpg9xh52
zpg9xh52
Definitional, with no premises to accept.
Set.mem_sdiff
definitional fact