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Step * of Lemma sq_stable__iseg

∀[T:Type]. ∀l1,l2:T List.  SqStable(l1 ≤ l2)
BY
{ (Unfold `iseg` 0
   THEN Auto
   THEN Unfold `sq_stable` 0
   THEN Auto
   THEN (InstConcl [⌜nth_tl(||l1||;l2)⌝]⋅ THENA Auto)
   THEN SquashExRepD
   THEN HypSubst' (-1) 0
   THEN RWO "nth_tl_append" 0
   THEN Auto) }

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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}l1,l2:T  List.    SqStable(l1  \mleq{}  l2)


By

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Latex:
(Unfold  `iseg`  0
  THEN  Auto
  THEN  Unfold  `sq\_stable`  0
  THEN  Auto
  THEN  (InstConcl  [\mkleeneopen{}nth\_tl(||l1||;l2)\mkleeneclose{}]\mcdot{}  THENA  Auto)
  THEN  SquashExRepD
  THEN  HypSubst'  (-1)  0
  THEN  RWO  "nth\_tl\_append"  0
  THEN  Auto)

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