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Step * of Lemma sg-inv_functionality

∀[sg:s-GroupStructure]. ∀[x1,x2:Point].  x1^-1 ≡ x2^-1 supposing x1 ≡ x2
BY
{ (Auto THEN RepeatFor 2 (ParallelLast) THEN FLemma `sg-inv-sep` [-1] THEN Auto) }

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Latex:

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Latex:
\mforall{}[sg:s-GroupStructure].  \mforall{}[x1,x2:Point].    x1\^{}-1  \mequiv{}  x2\^{}-1  supposing  x1  \mequiv{}  x2


By

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Latex:
(Auto  THEN  RepeatFor  2  (ParallelLast)  THEN  FLemma  `sg-inv-sep`  [-1]  THEN  Auto)

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