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Refined Gauss--Lobatto bounds for odd-order convexity

Kania, Tomasz et al.
arXiv (All) · Papers
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classical-analysis-and-odesnumerical-analysis
For functions that are convex of higher order, classical extremalities identify Gaussian quadrature as a lower bound and Gauss--Lobatto quadrature as an upper bound for the integral. We sharpen this bracket in every odd order: if $f$ is $(2n-1)$-convex on $[-1,1]$, then the exact integral $I[f]:=\in
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