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Step * of Lemma norm_subgrp_wf

∀[g:GrpSig]. (NormSubGrp{i}(g) ∈ 𝕌')
BY
{ Unfold `norm_subgrp` 0 THEN Auto }

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Latex:

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Latex:
\mforall{}[g:GrpSig].  (NormSubGrp\{i\}(g)  \mmember{}  \mBbbU{}')


By

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Latex:
Unfold  `norm\_subgrp`  0  THEN  Auto

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