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Step * of Lemma regext_wf2

∀[a:Set{i:l}]. (regext(a) ∈ Set{i:l})
BY
{ (Auto THEN setD 1 THEN ProveWfLemma) }

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Latex:

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Latex:
\mforall{}[a:Set\{i:l\}].  (regext(a)  \mmember{}  Set\{i:l\})


By

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Latex:
(Auto  THEN  setD  1  THEN  ProveWfLemma)

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