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Step * of Lemma bm_T-key_wf

∀[T,Key:Type]. ∀[v:binary_map(T;Key)].  bm_T-key(v) ∈ Key supposing ↑bm_T?(v)
BY
{ DepprodCoDatatypeSelectorWf }

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Latex:

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Latex:
\mforall{}[T,Key:Type].  \mforall{}[v:binary\_map(T;Key)].    bm\_T-key(v)  \mmember{}  Key  supposing  \muparrow{}bm\_T?(v)


By

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Latex:
DepprodCoDatatypeSelectorWf

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