theorem Set.eq_of_subset_of_subsettheorem Set.eq_of_subset_of_subset: ∀ {α : Type u} {a b : Set α}, a ⊆ b → b ⊆ a → a = b
Published by @sam · Jul 21, 2026
View source in zpg9xh52
zpg9xh52
Definitional, with no premises to accept.
Set.eq_of_subset_of_subset
definitional fact