exact AA.OneOfThree.first ‹n——m ≃ 0›
ℕ : Type
inst✝ : Natural ℕ
n m : ℕ
natOrderTri : AA.ExactlyOneOfThree (n < m) (n ≃ m) (n > m)
b✝ : n ≃ m
this : n——m ≃ 0
⊢ AA.OneOfThree (n——m ≃ 0) (Positive (n——m)) (Negative (n——m))
no goals