Finset.card_eq_succ_iff_cons

∀ {α : Type u_1} {s : Finset α} {n : ℕ}, s.card = n + 1 ↔ ∃ a t, ∃ (h : a ∉ t), Finset.cons a t h = s ∧ t.card = n

Defined in: Mathlib.Data.Finset.Card
Cited by: 0 results in Mathlib
Foundations: Depth 61 from the axioms · uses propext, Classical.choice, Quot.sound

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