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theorem Set.mem_sdiff_of_mem

theorem Set.mem_sdiff_of_mem
: ∀ {α : Type u} {s t : Set α} {x : α}, x ∈ s → ¬x ∈ t → x ∈ s \ t

Published by @sam ·

View source in zpg9xh52

Definitional, with no premises to accept.