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DONE
author soto <soto@cr.ie.u-ryukyu.ac.jp>
date Sat, 08 Jan 2022 12:41:39 +0900
parents 339fb67b4375
children
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rewrite-+-comm : (x y : !$\mathbb{N}$!) !$\rightarrow$! x + y !$\equiv$! y + x
rewrite-+-comm zero y rewrite (+zero {y}) = refl
rewrite-+-comm (suc x) y = ?