Finset.insert_erase_invOn

∀ {α : Type u_1} [inst : DecidableEq α] {a : α}, Set.InvOn (insert a) (fun s => s.erase a) {s | a ∈ s} {s | a ∉ s}

Defined in: Mathlib.Data.Finset.Basic
Cited by: 6 results in Mathlib
Foundations: Depth 57 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes: DecidableEq

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