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Step * of Lemma sum-map_wf

∀[T:Type]. ∀[f:T ⟶ ℤ]. ∀[L:T List].  (Σf[x] for x ∈ L ∈ ℤ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}[f:T  {}\mrightarrow{}  \mBbbZ{}].  \mforall{}[L:T  List].    (\mSigma{}f[x]  for  x  \mmember{}  L  \mmember{}  \mBbbZ{})


By

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Latex:
ProveWfLemma

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