Multiset.count_erase_self

∀ {α : Type u_1} [inst : DecidableEq α] (a : α) (s : Multiset α), Multiset.count a (s.erase a) = Multiset.count a s - 1

Defined in: Mathlib.Data.Multiset.AddSub
Cited by: 1 results in Mathlib
Foundations: Depth 20 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes: DecidableEq

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