exact orImplies₂ IH (And.right h')
l : List Prop
i : Nat
p₁ p₂ : Prop
ps : List Prop
h : ¬¬andN (p₁ :: p₂ :: ps)
h' : andN (p₁ :: p₂ :: ps)
i' : Nat
IH : ¬andN (p₂ :: ps) ∨ (p₂ :: ps).getD i' True
⊢ (p₁ :: p₂ :: ps).getD (i' + 1) True
no goals