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Step * of Lemma skip-first-class-property-iff

∀[Info,A:Type]. ∀[es:EO+(Info)]. ∀[e:E]. ∀[X:EClass(A)]. ∀[a:A].  uiff(a ∈ Skip(X)(e);False)
BY
{ (Auto
   THEN (Assert ⌜e ∈ E⌝⋅ THENA Auto)
   THEN RepUR ``classrel skip-first-class`` (-2)
   THEN (SplitOnHypITE (-2) THENA Auto)
   THEN Try (Complete (BagMemberD (-3)))
   THEN RWO "eo-forward-first2" (-1)
   THEN Auto) }

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Latex:

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Latex:
\mforall{}[Info,A:Type].  \mforall{}[es:EO+(Info)].  \mforall{}[e:E].  \mforall{}[X:EClass(A)].  \mforall{}[a:A].    uiff(a  \mmember{}  Skip(X)(e);False)


By

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Latex:
(Auto
  THEN  (Assert  \mkleeneopen{}e  \mmember{}  E\mkleeneclose{}\mcdot{}  THENA  Auto)
  THEN  RepUR  ``classrel  skip-first-class``  (-2)
  THEN  (SplitOnHypITE  (-2)  THENA  Auto)
  THEN  Try  (Complete  (BagMemberD  (-3)))
  THEN  RWO  "eo-forward-first2"  (-1)
  THEN  Auto)

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