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Step * of Lemma dl-choose_wf

∀[x1,x:Prog].  (x1 ⋃ x ∈ Prog)
BY
{ MrecConstructorWf }

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Latex:

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Latex:
\mforall{}[x1,x:Prog].    (x1  \mcup{}  x  \mmember{}  Prog)


By

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Latex:
MrecConstructorWf

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