simp at *
case inr.inr.inr.inr
n : ℕ
a b : Variables n order.GrLex
h✝ : Order.lex b a
neq : ¬Order.grlex.elem_sum a = Order.grlex.elem_sum a
h₁ : Order.grlex.elem_sum b ≤ Order.grlex.elem_sum a
h₂ : Order.grlex.elem_sum a ≤ Order.grlex.elem_sum b
contr : Order.grlex.elem_sum b = Order.grlex.elem_sum a
⊢ if Order.grlex.elem_sum b = Order.grlex.elem_sum a then True else False
no goals