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Sur l'intervalle de variabilité de \(\xi\) dans la formule \(\int\limits_{a}^{b} p(x) \varphi(x) \, dx = \varphi(\xi) \int\limits_{a}^{b} p(x) \, dx\). - MaRDI portal

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Sur l'intervalle de variabilité de \(\xi\) dans la formule \(\int\limits_{a}^{b} p(x) \varphi(x) \, dx = \varphi(\xi) \int\limits_{a}^{b} p(x) \, dx\). (Q572408)

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scientific article; zbMATH DE number 2556075
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English
Sur l'intervalle de variabilité de \(\xi\) dans la formule \(\int\limits_{a}^{b} p(x) \varphi(x) \, dx = \varphi(\xi) \int\limits_{a}^{b} p(x) \, dx\).
scientific article; zbMATH DE number 2556075

    Statements

    Sur l'intervalle de variabilité de \(\xi\) dans la formule \(\int\limits_{a}^{b} p(x) \varphi(x) \, dx = \varphi(\xi) \int\limits_{a}^{b} p(x) \, dx\). (English)
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    1931
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    An eine frühere Untersuchung (vgl. das vorige Referat) anschließend, beweist Verf., daß für ein reelles Polynom \(f(x)\) die Formel \[ f(b) = \sum\limits_{\nu=0}^{m-1} \frac{(b-a)^{\nu}}{\nu !} f^{(\nu)} (a) + \frac{(b-a)^m}{m !} f^{(m)} (\xi) \] gültig ist, wobei \(\xi\) zwischen der größten und kleinsten Nullstelle eines gewissen \textit{Jacobi}schen Polynoms liegt. (IV 3 B, 6 A.)
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