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Step * 1 1 2 1 of Lemma list-functor

.....wf..... 
1. T : Type
2. X : ℕ ⟶ Type
3. x : ⋂n:ℕ. (Unit ⋃ (T × (X n)))
4. isaxiom(x) = tt
⊢ x ∈ Unit
BY
{ (InstLemma `axiom-listunion` [⌜T⌝;⌜X 0⌝;⌜x⌝]⋅ THEN Auto) }

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Latex:

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Latex:
.....wf..... 
1.  T  :  Type
2.  X  :  \mBbbN{}  {}\mrightarrow{}  Type
3.  x  :  \mcap{}n:\mBbbN{}.  (Unit  \mcup{}  (T  \mtimes{}  (X  n)))
4.  isaxiom(x)  =  tt
\mvdash{}  x  \mmember{}  Unit


By

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Latex:
(InstLemma  `axiom-listunion`  [\mkleeneopen{}T\mkleeneclose{};\mkleeneopen{}X  0\mkleeneclose{};\mkleeneopen{}x\mkleeneclose{}]\mcdot{}  THEN  Auto)

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