Step * 1 of Lemma top-subtype-function

.....subterm..... T:t
1:n
1. Type
2. Type
3. ¬A
4. Top@i
⊢ x ∈ A ⟶ B
BY
TACTIC:(Unfold `member` THEN (Refine_functionExtensionality ⌜A⌝ `z'⋅ THEN Auto)⋅}


Latex:


Latex:
.....subterm.....  T:t
1:n
1.  A  :  Type
2.  B  :  Type
3.  \mneg{}A
4.  x  :  Top@i
\mvdash{}  x  \mmember{}  A  {}\mrightarrow{}  B


By


Latex:
TACTIC:(Unfold  `member`  0  THEN  (Refine\_functionExtensionality  \mkleeneopen{}A\mkleeneclose{}  `z'\mcdot{}  THEN  Auto)\mcdot{})




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