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Step * of Lemma concat-strict

∀[a:Base]. (a)↓ supposing (concat(a))↓
BY
{ (Auto THEN RepUR ``concat reduce`` -1 THEN RecUnfold `list_ind` (-1) THEN HasValueD (-1) THEN Trivial) }

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Latex:

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Latex:
\mforall{}[a:Base].  (a)\mdownarrow{}  supposing  (concat(a))\mdownarrow{}


By

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Latex:
(Auto
  THEN  RepUR  ``concat  reduce``  -1
  THEN  RecUnfold  `list\_ind`  (-1)
  THEN  HasValueD  (-1)
  THEN  Trivial)

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