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Step * 1 of Lemma length-wf-co-list-islist


1. T : Type
2. t : colist(T)
3. (is-list(t))↓
⊢ ||t|| ∈ ℕ
BY
{ (BLemma `termination`
   THEN Try ((BLemma `islist-iff-length-has-value` THEN Auto))
   THEN Try (RWO "length-is-colength" 0)
   THEN Auto) }

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Latex:

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Latex:

1.  T  :  Type
2.  t  :  colist(T)
3.  (is-list(t))\mdownarrow{}
\mvdash{}  ||t||  \mmember{}  \mBbbN{}


By

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Latex:
(BLemma  `termination`
  THEN  Try  ((BLemma  `islist-iff-length-has-value`  THEN  Auto))
  THEN  Try  (RWO  "length-is-colength"  0)
  THEN  Auto)

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