intro hq hp
case h2.h2
α : Sort u
inst✝² : DecidableEq α
p q : Prop
inst✝¹ : Decidable p
inst✝ : Decidable q
⊢ ¬q → ¬p → (decide p && decide q) = decide (p ∧ q)
case h2.h2
α : Sort u
inst✝² : DecidableEq α
p q : Prop
inst✝¹ : Decidable p
inst✝ : Decidable q
hq : ¬q
hp : ¬p
⊢ (decide p && decide q) = decide (p ∧ q)