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Theorems · Theorem · combinatorics

List.foldl_eq_foldr

∀ {α : Type u_1} {l : List α} {a : α} {f : α → α → α} [hf : Std.Commutative f] [Std.Associative f],
  List.foldl f a l = List.foldr f a l

First Bird–Wadler duality theorem for commutative functions.

Defined in
Mathlib.Data.List.Fold
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Foundations
Depth 10 from the axioms · uses propext
Assumes
Std.CommutativeStd.Associative
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