simp only [orN, notList, map]
l : List Prop
h₁ h₂ : Prop
t : List Prop
h : andN (h₁ :: h₂ :: t)
⊢ ¬orN (notList (h₁ :: h₂ :: t))
l : List Prop
h₁ h₂ : Prop
t : List Prop
h : andN (h₁ :: h₂ :: t)
⊢ ¬(¬h₁ ∨ orN ((¬h₂) :: map Not t))