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Step * of Lemma grp_sig_wf

GrpSig ∈ 𝕌'
BY
{ Unfold `grp_sig` 0 THEN Auto }

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Latex:

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Latex:
GrpSig  \mmember{}  \mBbbU{}'


By

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Latex:
Unfold  `grp\_sig`  0  THEN  Auto

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