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Step * of Lemma tree_size_wf

∀[E:Type]. ∀[p:tree(E)].  (tree_size(p) ∈ ℕ)
BY
{ ProveCoSizeWf2 `treeco_size` }

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Latex:

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Latex:
\mforall{}[E:Type].  \mforall{}[p:tree(E)].    (tree\_size(p)  \mmember{}  \mBbbN{})


By

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Latex:
ProveCoSizeWf2  `treeco\_size`

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