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Step * of Lemma rng_lsum_wf

∀[r:Rng]. ∀[A:Type]. ∀[f:A ⟶ |r|]. ∀[as:A List].  (Σ{r} x ∈ as. f[x] ∈ |r|)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[r:Rng].  \mforall{}[A:Type].  \mforall{}[f:A  {}\mrightarrow{}  |r|].  \mforall{}[as:A  List].    (\mSigma{}\{r\}  x  \mmember{}  as.  f[x]  \mmember{}  |r|)


By

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Latex:
ProveWfLemma

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