Finsupp.update_eq_add_single

∀ {ι : Type u_1} {M : Type u_3} [inst : AddZeroClass M] {f : ι →₀ M} {a : ι},
  f a = 0 → ∀ (b : M), f.update a b = f + fun₀ | a => b

Defined in: Mathlib.Algebra.Group.Finsupp
Cited by: 3 results in Mathlib
Foundations: Depth 68 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes: AddZeroClass

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