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author soto <soto@cr.ie.u-ryukyu.ac.jp>
date Thu, 12 Jan 2023 20:28:50 +0900
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rewrite-+-comm : (x y : ℕ) → x + y ≡ y + x
rewrite-+-comm zero y rewrite (+zero {y}) = refl
rewrite-+-comm (suc x) y = ?