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Step * 1 1 2 of Lemma Russell-theorem

.....subterm..... T:t
2:n
1. Type ∈ Type
2. ¬(Russell ∈ Russell)
3. T : Type ⋂ Base
⊢ ¬(T ∈ T) ∈ Type
BY
{ (Assert ⌜T ∈ Base⌝⋅ THEN Auto) }

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Latex:

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Latex:
.....subterm.....  T:t
2:n
1.  Type  \mmember{}  Type
2.  \mneg{}(Russell  \mmember{}  Russell)
3.  T  :  Type  \mcap{}  Base
\mvdash{}  \mneg{}(T  \mmember{}  T)  \mmember{}  Type


By

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Latex:
(Assert  \mkleeneopen{}T  \mmember{}  Base\mkleeneclose{}\mcdot{}  THEN  Auto)

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