Finset.mem_of_mem_insert_of_ne

∀ {α : Type u_1} [inst : DecidableEq α] {s : Finset α} {a b : α}, b ∈ insert a s → b ≠ a → b ∈ s

Defined in: Mathlib.Data.Finset.Insert
Cited by: 8 results in Mathlib
Foundations: Depth 55 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes: DecidableEq

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