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Step * of Lemma append_rel_wf

∀[T:Type]. ∀[L1,L2,L:T List].  (append_rel(T;L1;L2;L) ∈ ℙ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}[L1,L2,L:T  List].    (append\_rel(T;L1;L2;L)  \mmember{}  \mBbbP{})


By

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Latex:
ProveWfLemma

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