view src/zero.agda.replaced @ 0:85ee6174f90a default tip

add paper
author ryokka
date Wed, 12 Feb 2020 17:55:00 +0900
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+zero : { y : @$\mathbb{N}$@ } @$\rightarrow$@ y + zero  @$\equiv$@ y
+zero {zero} = refl
+zero {suc y} = cong suc ( +zero {y} )