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Step * of Lemma decidable__f-proper-subset

∀[T:Type]. ∀eq:EqDecider(T). ∀xs,ys:fset(T).  Dec(xs ⊆≠ ys)
BY
{ (Auto THEN RW  assert_pushupC 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}eq:EqDecider(T).  \mforall{}xs,ys:fset(T).    Dec(xs  \msubseteq{}\mneq{}  ys)


By

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Latex:
(Auto  THEN  RW    assert\_pushupC  0  THEN  Auto)

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