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author soto@cr.ie.u-ryukyu.ac.jp
date Tue, 08 Sep 2020 18:38:08 +0900
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+-comm : (x y : ℕ) → x + y ≡ y + x
+-comm zero y rewrite (+zero {y}) = refl
+-comm (suc x) y = let open ≡-Reasoning in
  begin
  ?0 ≡⟨ ?1 ⟩
  ?2 ∎

-- ?0 : ℕ {(suc x) + y}
-- ?1 : suc x + y ≡ y + suc x
-- ?2 : ℕ