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Step * of Lemma tree-height_wf

∀[x:Type]. ∀[t:tree(x)].  (tree-height(t) ∈ ℕ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[x:Type].  \mforall{}[t:tree(x)].    (tree-height(t)  \mmember{}  \mBbbN{})


By

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Latex:
ProveWfLemma

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