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Step * of Lemma sg-inv-id

∀[sg:s-Group]. 1^-1 ≡ 1
BY
{ (Auto THEN BLemma `sg-inv-unique` THEN Auto) }

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Latex:

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Latex:
\mforall{}[sg:s-Group].  1\^{}-1  \mequiv{}  1


By

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Latex:
(Auto  THEN  BLemma  `sg-inv-unique`  THEN  Auto)

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