Set.eq_insert_of_ncard_eq_succ

∀ {α : Type u_1} {s : Set α} {n : ℕ}, s.ncard = n + 1 → ∃ a t, a ∉ t ∧ insert a t = s ∧ t.ncard = n

Defined in: Mathlib.Data.Set.Card
Cited by: 1 results in Mathlib
Foundations: Depth 97 from the axioms · uses propext, Classical.choice, Quot.sound

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