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Step * of Lemma fps-add-comm

∀[X:Type]. ∀[r:CRng]. ∀[f,g:PowerSeries(X;r)].  ((f+g) = (g+f) ∈ PowerSeries(X;r))
BY
{ (Auto
   THEN (InstLemma `rng_plus_comm` [⌜r⌝]⋅ THENA Auto)
   THEN Fold `comm` (-1)
   THEN BLemma `fps-ext`
   THEN Auto
   THEN RepUR ``fps-add fps-coeff`` 0
   THEN Auto) }

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Latex:

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Latex:
\mforall{}[X:Type].  \mforall{}[r:CRng].  \mforall{}[f,g:PowerSeries(X;r)].    ((f+g)  =  (g+f))


By

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Latex:
(Auto
  THEN  (InstLemma  `rng\_plus\_comm`  [\mkleeneopen{}r\mkleeneclose{}]\mcdot{}  THENA  Auto)
  THEN  Fold  `comm`  (-1)
  THEN  BLemma  `fps-ext`
  THEN  Auto
  THEN  RepUR  ``fps-add  fps-coeff``  0
  THEN  Auto)

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