Set.ncard_le_ncard_insert

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

Defined in: Mathlib.Data.Set.Card
Cited by: 0 results in Mathlib
Foundations: Depth 101 from the axioms · uses propext, Classical.choice, Quot.sound

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