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Step * of Lemma rsum'-rsum

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∀[n,m:ℤ]. ∀[x:{n..m + 1-} ⟶ ℝ].  (Σ{x[k] | n≤k≤m} = rsum'(n;m;k.x[k]))
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\mforall{}[n,m:\mBbbZ{}].  \mforall{}[x:\{n..m  +  1\msupminus{}\}  {}\mrightarrow{}  \mBbbR{}].    (\mSigma{}\{x[k]  |  n\mleq{}k\mleq{}m\}  =  rsum'(n;m;k.x[k]))


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