Theorem: LO.Propositional.Superintuitionistic.Formula.iff_def (Logic/Propositional/Superintuitionistic/Formula.lean)

State before:
α : Type u_1
p q : Formula α
⊢ p ⟷ q = (p ⟶ q) ⋏ (q ⟶ p)
Tactic:
rfl
State after:
no goals