English

Evaluation of some non-elementary integrals involving the generalized hypergeometric function with some applications

Classical Analysis and ODEs 2020-05-27 v3

Abstract

The indefinite integral xαeηxβpFq(a1,a2,ap;b1,b2,,bq;λxγ)dx, \int x^\alpha e^{\eta x^\beta}\,_pF_q (a_1, a_2, \cdot\cdot\cdot a_p; b_1, b_2, \cdot\cdot\cdot, b_q; \lambda x^{\gamma})dx, where α,η,β,λ,γ0\alpha, \eta, \beta, \lambda, \gamma\ne0 are real or complex constants and pFq_pF_q is the generalized hypergeometric function, is evaluated in terms of an infinite series involving the generalized hypergeometric function. Related integrals in which the exponential function eηxβe^{\eta x^\beta} is either replaced by the hyperbolic function cosh(ηxβ)\cosh\left(\eta x^\beta\right) or sinh(ηxβ)\sinh\left(\eta x^\beta\right), or the sinusoidal function cos(ηxβ)\cos\left(\eta x^\beta\right) or sin(ηxβ)\sin\left(\eta x^\beta\right), are also evaluated in terms of infinite series involving the generalized hypergeometric function pFq_pF_q. Some application examples from applied analysis, in which some new Fourier and Laplace integrals (or transforms) are evaluated, are given. The analytical solution of the Orr-Sommerfeld equation (with a linear mean flow background) in the short-wave limit is expressed in terms of some infinite series involving the hypergeometric series 2F3_2F_3. Making use of the hyperbolic and Euler identities, some interesting series identities involving exponential, hyperbolic, trigonometric functions and the generalized hypergeometric function are also derived.

Keywords

Cite

@article{arxiv.2003.07403,
  title  = {Evaluation of some non-elementary integrals involving the generalized hypergeometric function with some applications},
  author = {Victor Nijimbere},
  journal= {arXiv preprint arXiv:2003.07403},
  year   = {2020}
}

Comments

35 pages, improved submitted version

R2 v1 2026-06-23T14:16:39.554Z