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Step * of Lemma permutation_wf

∀[A:Type]. ∀[L1,L2:A List].  (permutation(A;L1;L2) ∈ ℙ)
BY
{ (Unfold `permutation` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[A:Type].  \mforall{}[L1,L2:A  List].    (permutation(A;L1;L2)  \mmember{}  \mBbbP{})


By

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Latex:
(Unfold  `permutation`  0  THEN  Auto)

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