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Bounds and algorithms for the K-Bessel function of imaginary order
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics.
2013 (English)In: LMS Journal of Computation and Mathematics, ISSN 1461-1570, E-ISSN 1461-1570, Vol. 16, 78-108 p.Article in journal (Refereed) Published
Abstract [en]

Using the paths of steepest descent, we prove precise bounds with numerical implied constants for the modified Bessel function K-ir(x) of imaginary order and its first two derivatives with respect to the order. We also prove precise asymptotic bounds on more general (mixed) derivatives without working out numerical implied constants. Moreover, we present an absolutely and rapidly convergent series for the computation of K-ir(x) and its derivatives, as well as a formula based on Fourier interpolation for computing with many values of r. Finally, we have implemented a subset of these features in a software library for fast and rigorous computation of K-ir(x).

Place, publisher, year, edition, pages
2013. Vol. 16, 78-108 p.
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Natural Sciences
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URN: urn:nbn:se:uu:diva-213100DOI: 10.1112/S1461157013000028ISI: 000327100900005OAI: oai:DiVA.org:uu-213100DiVA: diva2:681198
Available from: 2013-12-19 Created: 2013-12-18 Last updated: 2017-12-06Bibliographically approved

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Strombergsson, Andreas

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