FAST EXPANSIONS OF DISCONTINUOUS FUNCTIONS WITH THE POSSIBILITY OF THEIR MULTIPLE DIFFERENTIATION

Authors

DOI:

https://doi.org/10.17308/sait/1995-5499/2025/4/5-19

Keywords:

fast expansion method, A. N. Krylov’s method, discontinuous functions, discontinuity of the first kind, continuous function, boundary function, high accuracy

Abstract

The theorems are proved on the impossibility of term-by-term differentiation of classical Fourier series for discontinuous functions, since this action leads to divergent series, and on the impossibility of differentiating Fourier series in the limiting case when specifying inconsistent boundary conditions. The possibility of applying the method of fast expansions in combination with the method of A. N. Krylov when considering discontinuous functions is shown. Multiple differentiation of fast Fourier series of discontinuous functions is considered for the first time. For the obtained continuous function, the Fourier series of the function quickly converges on the specified segment, including its endpoints, which is especially valuable when considering engineering problems. The proposed fast expansion is applicable to constructing solutions to applied integro-differential problems of various orders with discontinuities of the first kind and more complex discontinuities. A statement of a boundary integro-differential problem of the second order is given, in which the definite integral is written with a variable upper limit of the unknown function. The solution to this problem is a discontinuous function with a rapidly converging Fourier series and the ability to differentiate it a predetermined number of times. T he given test example showed that when using a fourth-order boundary function and even one member of the Fourier series in a fast expansion, the maximum absolute error in determining the unknown function does not exceed 2.4·10–20. The solution to such problems in analytical form was previously unknown.

Author Biographies

  • Alexander D. Chernyshov, Voronezh State University of Engineering Technologies

    Dr. Phys. & Math. Sci., Professor, Department of Higher Mathematics

  • Vitaly V. Goryainov, Voronezh State Technical University

    Ph.D. in Phys. & Math., Assoc. Professor, Department of Applied Mathematics and Mechanics

  • Mikhail I. Popov, Voronezh State University

    Ph.D. in Phys. & Math., Assoc. Professor, Department of Digital Technologies

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Published

2025-12-11

Issue

Section

Mathematical Methods of System Analysis, Management and Modelling

How to Cite

FAST EXPANSIONS OF DISCONTINUOUS FUNCTIONS WITH THE POSSIBILITY OF THEIR MULTIPLE DIFFERENTIATION. (2025). Proceedings of Voronezh State University. Series: Systems Analysis and Information Technologies, 4, 5-19. https://doi.org/10.17308/sait/1995-5499/2025/4/5-19