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Step * of Lemma rsum_wf

∀[n,m:ℤ]. ∀[x:{n..m + 1-} ⟶ ℝ].  (Σ{x[k] | n≤k≤m} ∈ ℝ)
BY
{ (Unfold `rsum` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[n,m:\mBbbZ{}].  \mforall{}[x:\{n..m  +  1\msupminus{}\}  {}\mrightarrow{}  \mBbbR{}].    (\mSigma{}\{x[k]  |  n\mleq{}k\mleq{}m\}  \mmember{}  \mBbbR{})


By

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Latex:
(Unfold  `rsum`  0  THEN  Auto)

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