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Step * of Lemma rv-perm-inv

∀[rv,x:Top].  (x^-1 ~ let f,g = x in <g, f>)
BY
{ (RepUR ``rv-permutation-group permutation-s-group sg-inv mk-s-group`` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[rv,x:Top].    (x\^{}-1  \msim{}  let  f,g  =  x  in  <g,  f>)


By

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Latex:
(RepUR  ``rv-permutation-group  permutation-s-group  sg-inv  mk-s-group``  0  THEN  Auto)

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