Step * of Lemma strong-subtype-fset-member-type

[A,B:Type]. ∀[eq:EqDecider(B)].  ∀[s:fset(A)]. ∀[x:B].  x ∈ supposing x ∈ supposing strong-subtype(A;B)
BY
(TACTIC:BasicUniformUnivCD Auto THEN Assert ⌜s ∈ fset(B)⌝⋅ THEN Auto) }

1
1. Type
2. Type
3. eq EqDecider(B)
4. strong-subtype(A;B)
5. fset(A)
6. B
7. s ∈ fset(B)
8. x ∈ s
⊢ x ∈ A


Latex:


Latex:
\mforall{}[A,B:Type].  \mforall{}[eq:EqDecider(B)].
    \mforall{}[s:fset(A)].  \mforall{}[x:B].    x  \mmember{}  A  supposing  x  \mmember{}  s  supposing  strong-subtype(A;B)


By


Latex:
(TACTIC:BasicUniformUnivCD  Auto  THEN  Assert  \mkleeneopen{}s  \mmember{}  fset(B)\mkleeneclose{}\mcdot{}  THEN  Auto)




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