no goals
F : Type ?u.114914
α : Type u_1
β : Type ?u.114920
γ : Type ?u.114923
inst✝ : Group α
s t : Set α
a b : α
⊢ 1 ∈ s / t ↔ ¬Disjoint s t
simp [not_disjoint_iff_nonempty_inter, mem_div, div_eq_one, Set.Nonempty]