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Step * of Lemma sg-op_wf

∀[sg:s-GroupStructure]. ∀[x,y:Point].  ((x y) ∈ Point)
BY
{ (Auto THEN D 1 THEN Auto THEN ProveWfLemma) }

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Latex:

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Latex:
\mforall{}[sg:s-GroupStructure].  \mforall{}[x,y:Point].    ((x  y)  \mmember{}  Point)


By

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Latex:
(Auto  THEN  D  1  THEN  Auto  THEN  ProveWfLemma)

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