Finsupp.update_eq_sub_add_single

∀ {ι : Type u_1} {G : Type u_6} [inst : AddGroup G] (f : ι →₀ G) (a : ι) (b : G),
  f.update a b = (f - fun₀ | a => f a) + fun₀ | a => b

Defined in: Mathlib.Algebra.Group.Finsupp
Cited by: 0 results in Mathlib
Foundations: Depth 68 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes: AddGroup

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