Finset.prod_eq_single_of_mem

∀ {ι : Type u_1} {M : Type u_4} [inst : CommMonoid M] {s : Finset ι} {f : ι → M},
  ∀ a ∈ s, (∀ b ∈ s, b ≠ a → f b = 1) → ∏ x ∈ s, f x = f a

Defined in: Mathlib.Algebra.BigOperators.Group.Finset.Basic
Cited by: 5 results in Mathlib
Foundations: Depth 68 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes: CommMonoid

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