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Step * of Lemma Riemann-integral_wf

∀[a:ℝ]. ∀[b:{b:ℝ| a ≤ b} ]. ∀[f:{f:[a, b] ⟶ℝ| ifun(f;[a, b])} ].  (∫ f[x] dx on [a, b] ∈ ℝ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[a:\mBbbR{}].  \mforall{}[b:\{b:\mBbbR{}|  a  \mleq{}  b\}  ].  \mforall{}[f:\{f:[a,  b]  {}\mrightarrow{}\mBbbR{}|  ifun(f;[a,  b])\}  ].    (\mint{}  f[x]  dx  on  [a,  b]  \mmember{}  \mBbbR{})


By

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Latex:
ProveWfLemma

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