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Step * 1 1 of Lemma boundary-polyhedron-subtype

.....wf..... 
1. k : ℕ
2. n : ℕ+
3. K : n-dim-complex
4. x : ℝ^k
5. i : ℕ||∂(K)||
6. in-rat-cube(k;x;∂(K)[i])
7. (∂(K)[i] ∈ ∂(K))
⊢ ∂(K)[i] ∈ ℚCube(k)
BY
{ (RepeatFor 2 (Thin (-1)) THEN MoveToConcl (-1) THEN (GenConclTerm ⌜∂(K)⌝⋅ THENA Auto) THEN D -2 THEN Auto) }

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Latex:

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Latex:
.....wf..... 
1.  k  :  \mBbbN{}
2.  n  :  \mBbbN{}\msupplus{}
3.  K  :  n-dim-complex
4.  x  :  \mBbbR{}\^{}k
5.  i  :  \mBbbN{}||\mpartial{}(K)||
6.  in-rat-cube(k;x;\mpartial{}(K)[i])
7.  (\mpartial{}(K)[i]  \mmember{}  \mpartial{}(K))
\mvdash{}  \mpartial{}(K)[i]  \mmember{}  \mBbbQ{}Cube(k)


By

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Latex:
(RepeatFor  2  (Thin  (-1))
  THEN  MoveToConcl  (-1)
  THEN  (GenConclTerm  \mkleeneopen{}\mpartial{}(K)\mkleeneclose{}\mcdot{}  THENA  Auto)
  THEN  D  -2
  THEN  Auto)

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