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Quarterly of Applied Mathematics

Quarterly of Applied Mathematics

Online ISSN 1552-4485; Print ISSN 0033-569X

   
 
 

 

Integral relations associated with the semi-infinite Hilbert transform and applications to singular integral equations


Authors: Y. A. Antipov and S. M. Mkhitaryan
Journal: Quart. Appl. Math. 76 (2018), 739-766
MSC (2010): Primary 30E20, 42C05, 44A15, 44A20; Secondary 65D32
DOI: https://doi.org/10.1090/qam/1508
Published electronically: May 16, 2018
MathSciNet review: 3855829
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Abstract: Integral relations with the Cauchy kernel on a semi-axis for the Laguerre polynomials, the confluent hypergeometric function, and the cylindrical functions are derived. A part of these formulas is obtained by exploiting some properties of the Hermite polynomials, including their Hilbert and Fourier transforms and connections to the Laguerre polynomials. The relations discovered give rise to complete systems of new orthogonal functions. Free of singular integrals, exact and approximate solutions to the characteristic and complete singular integral equations in a semi-infinite interval are proposed. Another set of the Hilbert transforms in a semi-axis are deduced from integral relations with the Cauchy kernel in a finite segment for the Jacobi polynomials and the Jacobi functions of the second kind by letting some parameters involved go to infinity. These formulas lead to integral relations for the Bessel functions. Their application to a model problem of contact mechanics is given. A new quadrature formula for the Cauchy integral in a semi-axis based on an integral relation for the Laguerre polynomials and the confluent hypergeometric function is derived and tested numerically. Bounds for the remainder are found.


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Additional Information

Y. A. Antipov
Affiliation: Department of Mathematics, Louisiana State University, Baton Rouge, Louisiana 70803
MR Author ID: 245270
Email: yantipov@lsu.edu

S. M. Mkhitaryan
Affiliation: Department of Mechanics of Elastic and Viscoelastic Bodies, National Academy of Sciences, Yerevan 0019, Armenia
MR Author ID: 194038
Email: smkhitaryan39@rambler.ru

Keywords: Hilbert transform, orthogonal polynomials, singular integral equations, quadrature formulas
Received by editor(s): February 13, 2018
Published electronically: May 16, 2018
Additional Notes: The research of the first author was sponsored by the Army Research Office and was accomplished under Grant Number W911NF-17-1-0157. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Office or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein.
Article copyright: © Copyright 2018 Brown University