exact Rel.trans_failR ‹a ≃ -1› neg_one_neqv_zero ‹a ≃ 0›
ℕ : Type
inst✝⁴ : Natural ℕ
ℤ : Type
inst✝³ : Core ℤ
inst✝² : Addition ℤ
inst✝¹ : Multiplication ℤ
inst✝ : Negation ℤ
a : ℤ
two : AA.TwoOfThree (a ≃ 0) (a ≃ 1) (a ≃ -1)
a✝ : a ≃ 0
c✝ : a ≃ -1
⊢ False
no goals