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Step * of Lemma l_member_subtype2

∀[A,B:Type].  ∀L:A List. ∀x:A.  {(x ∈ L) ⇒ (x ∈ L)} supposing A ⊆r B
BY
{ ((InstLemma `l_member_subtype` []) THEN Unfold `guard` 0 THEN Trivial) }

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Latex:

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Latex:
\mforall{}[A,B:Type].    \mforall{}L:A  List.  \mforall{}x:A.    \{(x  \mmember{}  L)  {}\mRightarrow{}  (x  \mmember{}  L)\}  supposing  A  \msubseteq{}r  B


By

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Latex:
((InstLemma  `l\_member\_subtype`  [])  THEN  Unfold  `guard`  0  THEN  Trivial)

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