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Step * 1 1 of Lemma base-member-partial


1. A : Type
2. value-type(A)
3. a : Base
4. a ∈ A supposing (a)↓
5. ¬is-exception(a)
⊢ a ∈ partial(A)
BY
{ TACTIC:(Assert ⌜a ∈ base-partial(A)⌝⋅ THEN MemTypeCD THEN Auto) }

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Latex:

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Latex:

1.  A  :  Type
2.  value-type(A)
3.  a  :  Base
4.  a  \mmember{}  A  supposing  (a)\mdownarrow{}
5.  \mneg{}is-exception(a)
\mvdash{}  a  \mmember{}  partial(A)


By

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Latex:
TACTIC:(Assert  \mkleeneopen{}a  \mmember{}  base-partial(A)\mkleeneclose{}\mcdot{}  THEN  MemTypeCD  THEN  Auto)

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