[Merged by Bors] - feat(finsupp/basic): add hom_ext #3941
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Two R-module homs from finsupp X R which agree on `single x 1` agree everywhere. ``` lemma hom_ext [semiring β] [add_comm_monoid γ] [semimodule β γ] (φ ψ : (α →₀ β) →ₗ[β] γ) (h : ∀ a : α, φ (single a 1) = ψ (single a 1)) : φ = ψ ```
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Two R-module homs from finsupp X R which agree on `single x 1` agree everywhere. ``` lemma hom_ext [semiring β] [add_comm_monoid γ] [semimodule β γ] (φ ψ : (α →₀ β) →ₗ[β] γ) (h : ∀ a : α, φ (single a 1) = ψ (single a 1)) : φ = ψ ```
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Two R-module homs from finsupp X R which agree on `single x 1` agree everywhere. ``` lemma hom_ext [semiring β] [add_comm_monoid γ] [semimodule β γ] (φ ψ : (α →₀ β) →ₗ[β] γ) (h : ∀ a : α, φ (single a 1) = ψ (single a 1)) : φ = ψ ```
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Two R-module homs from finsupp X R which agree on
single x 1agree everywhere.