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Step * of Lemma psub_wf

∀[a,b:formula()].  (a ⊆ b ∈ ℙ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[a,b:formula()].    (a  \msubseteq{}  b  \mmember{}  \mBbbP{})


By

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Latex:
ProveWfLemma

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