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Step * 1 of Lemma sum-nat


1. n : ℕ
2. f : ℕn ⟶ ℕ
⊢ Σ(f[x] | x < n) ∈ ℤ
BY
{ Auto }

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Latex:

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Latex:

1.  n  :  \mBbbN{}
2.  f  :  \mBbbN{}n  {}\mrightarrow{}  \mBbbN{}
\mvdash{}  \mSigma{}(f[x]  |  x  <  n)  \mmember{}  \mBbbZ{}


By

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Latex:
Auto

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