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Step * of Lemma dl-logical-eq_wf

∀[a,b:Prog].  ((a ⇐⇒ b) ∈ ℙ')
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[a,b:Prog].    ((a  \mLeftarrow{}{}\mRightarrow{}  b)  \mmember{}  \mBbbP{}')


By

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Latex:
ProveWfLemma

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