Step
*
of Lemma
grp_wf
Group{i} ∈ 𝕌'
BY
{ Unfold `grp` 0 THEN Auto }
Latex:
Latex:
Group\{i\}  \mmember{}  \mBbbU{}'
By
Latex:
Unfold  `grp`  0  THEN  Auto
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