Step
*
1
1
of Lemma
strong-subtype-b-union
1. A : Type
2. B : Type
3. ¬A ⋂ B
4. strong-subtype(A ⋂ B;Void)
⊢ strong-subtype(A ⋂ B;B)
BY
{ (UseTrans ⌜Void⌝⋅ THEN Auto) }
Latex:
Latex:
1. A : Type
2. B : Type
3. \mneg{}A \mcap{} B
4. strong-subtype(A \mcap{} B;Void)
\mvdash{} strong-subtype(A \mcap{} B;B)
By
Latex:
(UseTrans \mkleeneopen{}Void\mkleeneclose{}\mcdot{} THEN Auto)
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