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Step * of Lemma sum_wf

∀[n:ℕ]. ∀[f:ℕn ⟶ ℤ].  (Σ(f[x] | x < n) ∈ ℤ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[n:\mBbbN{}].  \mforall{}[f:\mBbbN{}n  {}\mrightarrow{}  \mBbbZ{}].    (\mSigma{}(f[x]  |  x  <  n)  \mmember{}  \mBbbZ{})


By

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Latex:
ProveWfLemma

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