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Step * of Lemma class-opt_wf

∀[Info,T:Type]. ∀[X:EClass(T)]. ∀[b:Id ─→ bag(T)].  (X?b ∈ EClass(T))
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[Info,T:Type].  \mforall{}[X:EClass(T)].  \mforall{}[b:Id  {}\mrightarrow{}  bag(T)].    (X?b  \mmember{}  EClass(T))


By

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Latex:
ProveWfLemma

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