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A Divergent Sequence of Romberg Integrals

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Abstract

Romberg integrals are built in order to accelerate the convergence of sequences of trapezoidal rules for approximating the definite integral of a continuous function f. While every sequence of trapezoidal rules with decreasing step length converges whenever f is continuous, this does not always hold for Romberg integrals. In this note we present a concrete example for which the sequence formed by the diagonal elements of the Romberg table diverges when the number of points used to compute the trapezoidal rules grows too slowly.

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Correspondence to André Pierro de Camargo.

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de Camargo, A.P. A Divergent Sequence of Romberg Integrals. Results Math 75, 11 (2020). https://doi.org/10.1007/s00025-019-1140-6

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