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Theorems · Theorem · combinatorics

List.count_diff

∀ {α : Type u_1} [inst : BEq α] [LawfulBEq α] (a : α) (l₁ l₂ : List α),
  List.count a (l₁.diff l₂) = List.count a l₁ - List.count a l₂
Defined in
Mathlib.Data.List.Count
Cited by
1 results in Mathlib
Foundations
Depth 18 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes
BEqLawfulBEq
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Multiset.count_sub · cited by 12Multiset.count_subList.count_diffCITED BYCITES

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