no goals
X : Type u_1
α : Type u_2
α' : Type ?u.750
β : Type ?u.753
γ : Type ?u.756
δ : Type ?u.759
M : Type ?u.762
E : Type ?u.765
R : Type ?u.768
inst✝¹ : One α
inst✝ : TopologicalSpace X
f : X → α
⊢ mulTSupport f = ∅ ↔ f = 1
rw [mulTSupport, closure_empty_iff, mulSupport_eq_empty_iff]