simp only [← decide_and, decide_eq_false_iff_not]
case h
α : Type u
β : Type v
inst✝³ : BishopFin α
inst✝² : BishopFin β
p q : α → Prop
inst✝¹ : DecidablePred p
inst✝ : DecidablePred q
h : ∀ (a : α), ¬(p a ∧ q a)
⊢ ∀ (a : α), (decide (p a) && decide (q a)) = false
case h
α : Type u
β : Type v
inst✝³ : BishopFin α
inst✝² : BishopFin β
p q : α → Prop
inst✝¹ : DecidablePred p
inst✝ : DecidablePred q
h : ∀ (a : α), ¬(p a ∧ q a)
⊢ ∀ (a : α), ¬(p a ∧ q a)