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DONE
author soto <soto@cr.ie.u-ryukyu.ac.jp>
date Mon, 15 Feb 2021 23:36:39 +0900
parents 3dba680da508
children
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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 = ?