Step
*
of Lemma
fRuleexistsE-var_wf
∀[v:FOLRule()]. fRuleexistsE-var(v) ∈ ℤ supposing ↑fRuleexistsE?(v)
BY
{ DepprodCoDatatypeSelectorWf }
Latex:
Latex:
\mforall{}[v:FOLRule()].  fRuleexistsE-var(v)  \mmember{}  \mBbbZ{}  supposing  \muparrow{}fRuleexistsE?(v)
By
Latex:
DepprodCoDatatypeSelectorWf
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