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Step * 1 of Lemma cdrng_is_abdgrp


1. r : CRng
2. IsEqFun(|r|;=b)
⊢ r↓+gp ∈ AbGrp
BY
{ Auto }

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Latex:

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Latex:

1.  r  :  CRng
2.  IsEqFun(|r|;=\msubb{})
\mvdash{}  r\mdownarrow{}+gp  \mmember{}  AbGrp


By

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Latex:
Auto

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