ZFSet.card_insert

∀ {x y : ZFSet.{u}}, x ∉ y → (insert x y).card = y.card + 1

Defined in: Mathlib.SetTheory.ZFC.Cardinal
Cited by: 2 results in Mathlib
Foundations: Depth 72 from the axioms · uses propext, Classical.choice, Quot.sound

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