Set.ncard_sdiff_singleton_le

∀ {α : Type u_1} (s : Set α) (a : α), (s \ {a}).ncard ≤ s.ncard

Defined in: Mathlib.Data.Set.Card
Cited by: 1 results in Mathlib
Foundations: Depth 100 from the axioms · uses propext, Classical.choice, Quot.sound

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