apply And.intro <;> apply not_or.mpr
α : Type u
r s : α → α → Prop
a b : α
h : Incomp r a b ∧ Incomp s a b
⊢ ¬(r a b ∨ Incomp r a b ∧ s a b) ∧ ¬(r b a ∨ Incomp r b a ∧ s b a)
case left
α : Type u
r s : α → α → Prop
a b : α
h : Incomp r a b ∧ Incomp s a b
⊢ ¬r a b ∧ ¬(Incomp r a b ∧ s a b)

case right
α : Type u
r s : α → α → Prop
a b : α
h : Incomp r a b ∧ Incomp s a b
⊢ ¬r b a ∧ ¬(Incomp r b a ∧ s b a)