Union_is_Commutative_v2
Provedproofwikiretry
Set union is commutative.
Preamble
import Mathlib.Data.Set.Basic
Formal statement
theorem Union_is_Commutative_v2 {α : Type _} (S T : Set α) : S ∪ T = T ∪ S := by sorrySet union is commutative.
import Mathlib.Data.Set.Basic
theorem Union_is_Commutative_v2 {α : Type _} (S T : Set α) : S ∪ T = T ∪ S := by sorry