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Step * of Lemma double_sum_wf

∀[n,m:ℕ]. ∀[f:ℕn ⟶ ℕm ⟶ ℤ].  (sum(f[x;y] | x < n; y < m) ∈ ℤ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[n,m:\mBbbN{}].  \mforall{}[f:\mBbbN{}n  {}\mrightarrow{}  \mBbbN{}m  {}\mrightarrow{}  \mBbbZ{}].    (sum(f[x;y]  |  x  <  n;  y  <  m)  \mmember{}  \mBbbZ{})


By

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Latex:
ProveWfLemma

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