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Step * of Lemma pand_wf

∀[left,right:formula()].  (pand(left;right) ∈ formula())
BY
{ DepprodCoDatatypeConstructorWf `formula_size` }

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Latex:

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Latex:
\mforall{}[left,right:formula()].    (pand(left;right)  \mmember{}  formula())


By

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Latex:
DepprodCoDatatypeConstructorWf  `formula\_size`

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