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Step * of Lemma assert-is-rat-cube-face

∀k:ℕ. ∀c,d:ℚCube(k).  uiff(↑is-rat-cube-face(k;c;d);c ≤ d)
BY
{ ((UnivCD THENA Auto)
   THEN Unfold `is-rat-cube-face` 0
   THEN (GenConclTerm ⌜rat-cube-face-decider(k;c;d)⌝⋅ THENA Auto)
   THEN D -2
   THEN Reduce 0
   THEN Auto) }

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Latex:

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Latex:
\mforall{}k:\mBbbN{}.  \mforall{}c,d:\mBbbQ{}Cube(k).    uiff(\muparrow{}is-rat-cube-face(k;c;d);c  \mleq{}  d)


By

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Latex:
((UnivCD  THENA  Auto)
  THEN  Unfold  `is-rat-cube-face`  0
  THEN  (GenConclTerm  \mkleeneopen{}rat-cube-face-decider(k;c;d)\mkleeneclose{}\mcdot{}  THENA  Auto)
  THEN  D  -2
  THEN  Reduce  0
  THEN  Auto)

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