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Step * of Lemma l_disjoint-symmetry

∀[T:Type]. ∀[a,b:T List].  uiff(l_disjoint(T;b;a);l_disjoint(T;a;b))
BY
{ (Auto THEN RepeatFor 3 (ParallelLast) THEN Auto) }

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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}[a,b:T  List].    uiff(l\_disjoint(T;b;a);l\_disjoint(T;a;b))


By

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Latex:
(Auto  THEN  RepeatFor  3  (ParallelLast)  THEN  Auto)

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