Theorems · Theorem · ring theory

Finsupp.indicator_eq_sum_attach_single

∀ {α : Type u_1} {M : Type u_8} [inst : AddCommMonoid M] {s : Finset α} (f : (a : α) → a ∈ s → M),
  Finsupp.indicator s f = ∑ x ∈ s.attach, fun₀ | ↑x => f ↑x ⋯

Defined in

Mathlib.Algebra.BigOperators.Finsupp.Basic

Cited by

1 results in Mathlib

Foundations

Depth 78 from the axioms · uses propext, Classical.choice, Quot.sound

Assumes

AddCommMonoid