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Step * 1 of Lemma nim_sum0_lemma


1. y : Top
⊢ nim-sum(0;y) ~ y
BY
{ Try (RW (AddrC [1] (UnfoldC `nim-sum` ANDTHENC ReduceC)) 0)⋅ }

1
1. y : Top
⊢ y ~ y

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Latex:

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Latex:

1.  y  :  Top
\mvdash{}  nim-sum(0;y)  \msim{}  y


By

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Latex:
Try  (RW  (AddrC  [1]  (UnfoldC  `nim-sum`  ANDTHENC  ReduceC))  0)\mcdot{}

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