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Step * of Lemma FOL-subst_wf

∀[fmla:mFOL()]. ∀[nw,old:ℤ].  (fmla[nw/old] ∈ mFOL())
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[fmla:mFOL()].  \mforall{}[nw,old:\mBbbZ{}].    (fmla[nw/old]  \mmember{}  mFOL())


By

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Latex:
ProveWfLemma

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