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Step * 3 1 1 of Lemma islist-iff-length-has-value

.....subterm..... T:t
1:n
1. T : Type
2. j : ℤ
3. t : colist(T)@i
⊢ λx.Ax ∈ (⊥)↓ ⇒ (is-list(t))↓
BY
{ TACTIC:(MemCD THEN BotDiv THEN Auto) }

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Latex:

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Latex:
.....subterm.....  T:t
1:n
1.  T  :  Type
2.  j  :  \mBbbZ{}
3.  t  :  colist(T)@i
\mvdash{}  \mlambda{}x.Ax  \mmember{}  (\mbot{})\mdownarrow{}  {}\mRightarrow{}  (is-list(t))\mdownarrow{}


By

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Latex:
TACTIC:(MemCD  THEN  BotDiv  THEN  Auto)

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