Step
*
of Lemma
hgrp_of_ocgrp_wf
∀[g:OGrp]. (g↓hgrp ∈ GrpSig)
BY
{ ((D 0 THENM Unfolds ``hgrp_of_ocgrp grp_sig`` 0) THEN Auto) }
Latex:
Latex:
\mforall{}[g:OGrp].  (g\mdownarrow{}hgrp  \mmember{}  GrpSig)
By
Latex:
((D  0  THENM  Unfolds  ``hgrp\_of\_ocgrp  grp\_sig``  0)  THEN  Auto)
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