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Step * of Lemma alt-Riemann-sums-converge-ext

∀a:ℝ. ∀b:{b:ℝ| a ≤ b} . ∀f:[a, b] ⟶ℝ. ∀mc:f[x] continuous for x ∈ [a, b].  Riemann-sum-alt(f;a;b;k + 1)↓ as k→∞
BY
{ ... }

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Latex:

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Latex:
\mforall{}a:\mBbbR{}.  \mforall{}b:\{b:\mBbbR{}|  a  \mleq{}  b\}  .  \mforall{}f:[a,  b]  {}\mrightarrow{}\mBbbR{}.  \mforall{}mc:f[x]  continuous  for  x  \mmember{}  [a,  b].
    Riemann-sum-alt(f;a;b;k  +  1)\mdownarrow{}  as  k\mrightarrow{}\minfty{}


By

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Latex:
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