Finsupp.support_eq_singleton

∀ {α : Type u_1} {M : Type u_5} [inst : Zero M] {f : α →₀ M} {a : α}, f.support = {a} ↔ f a ≠ 0 ∧ f = fun₀ | a => f a

Defined in: Mathlib.Data.Finsupp.Single
Cited by: 2 results in Mathlib
Foundations: Depth 64 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes: Zero

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