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Step * of Lemma dl-box-1_wf

∀[x:Prop]. dl-box-1(x) ∈ Prog supposing ↑dl-box?(x)
BY
{ MrecSelectorWf dlElim }

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Latex:

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Latex:
\mforall{}[x:Prop].  dl-box-1(x)  \mmember{}  Prog  supposing  \muparrow{}dl-box?(x)


By

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Latex:
MrecSelectorWf  dlElim

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