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Step * of Lemma vars-of-subst_wf

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∀[opr:Type]. ∀[s:(varname() × term(opr)) List].  (vars-of-subst(s) ∈ {v:varname()| ¬(v = nullvar() ∈ varname())}  List)
BY
{ ProveWfLemma }

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Latex:

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Latex:
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\mforall{}[opr:Type].  \mforall{}[s:(varname()  \mtimes{}  term(opr))  List].
    (vars-of-subst(s)  \mmember{}  \{v:varname()|  \mneg{}(v  =  nullvar())\}    List)


By

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Latex:
ProveWfLemma

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