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Mathematics of Computation

Published by the American Mathematical Society since 1960 (published as Mathematical Tables and other Aids to Computation 1943-1959), Mathematics of Computation is devoted to research articles of the highest quality in computational mathematics.

ISSN 1088-6842 (online) ISSN 0025-5718 (print)

The 2020 MCQ for Mathematics of Computation is 1.78.

What is MCQ? The Mathematical Citation Quotient (MCQ) measures journal impact by looking at citations over a five-year period. Subscribers to MathSciNet may click through for more detailed information.

 

A posteriori error analysis for approximations of time-fractional subdiffusion problems
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by Lehel Banjai and Charalambos G. Makridakis HTML | PDF
Math. Comp. 91 (2022), 1711-1737 Request permission

Abstract:

In this paper we consider a sub-diffusion problem where the fractional time derivative is approximated either by the L1 scheme or by Convolution Quadrature. We propose new interpretations of the numerical schemes which lead to a posteriori error estimates. Our approach is based on appropriate pointwise representations of the numerical schemes as perturbed evolution equations and on stability estimates for the evolution equation. A posteriori error estimates in $L^2(H)$ and $L^\infty (H)$ norms of optimal order are derived. Extensive numerical experiments indicate the reliability and the optimality of the estimators for the schemes considered, as well as their efficiency as error indicators driving adaptive mesh selection locating singularities of the problem.
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Additional Information
  • Lehel Banjai
  • Affiliation: Maxwell Institute for Mathematical Sciences, School of Mathematical & Computer Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
  • MR Author ID: 702930
  • Email: l.banjai@hw.ac.uk
  • Charalambos G. Makridakis
  • Affiliation: Institute for Applied and Computational Mathematics-FORTH, Heraklion GR 70013, Crete, Greece; and Department of Mathematics, University of Sussex, Brighton BN1 9QH, United Kingdom
  • MR Author ID: 289627
  • Email: c.g.makridakis@iacm.forth.gr
  • Received by editor(s): December 30, 2020
  • Received by editor(s) in revised form: August 20, 2021, December 7, 2021, and December 28, 2021
  • Published electronically: March 14, 2022
  • © Copyright 2022 American Mathematical Society
  • Journal: Math. Comp. 91 (2022), 1711-1737
  • MSC (2020): Primary 35R11, 65M06, 65M15
  • DOI: https://doi.org/10.1090/mcom/3723
  • MathSciNet review: 4435945