intro (two : AA.TwoOfThree (a ≃ 0) (a ≃ 1) (a ≃ -1))
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
⊢ ¬AA.TwoOfThree (a ≃ 0) (a ≃ 1) (a ≃ -1)
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)
⊢ False