Theorem: tsum_support_eq (Matroid/ForMathlib/ENatTopology.lean)

State before:
α✝ : Type u_1
β✝ : Type u_2
ι : Type u_3
s : Set α✝
α : Type u_4
β : Type u_5
f : α → β
inst✝² : TopologicalSpace β
inst✝¹ : AddCommMonoid β
inst✝ : T2Space β
⊢ ∑' (x : ↑(support f)), f ↑x = ∑' (x : α), f x
Tactic:
simp [tsum_subtype]
State after:
no goals