Home Class of bounds of the generalized Volterra functions
Article
Licensed
Unlicensed Requires Authentication

Class of bounds of the generalized Volterra functions

  • Khaled Mehrez EMAIL logo , Kamel Brahim and Sergei M. Sitnik
Published/Copyright: May 24, 2024
Become an author with De Gruyter Brill

Abstract

In the present paper, we prove the monotonicity property of the ratios of the generalized Volterra function. As consequences, new and interesting monotonicity concerning ratios of the exponential integral function, as well as it yields some new functional inequalities including Turán-type inequalities. Moreover, two-side bounding inequalities are then obtained for the generalized Volterra function. The main mathematical tools are some integral inequalities. As applications, a few of upper and lower bound inequalities for the exponential integral function are derived. The various results, which are established in this paper, are presumably new, and their importance is illustrated by several interesting consequences and examples accompanied by graphical representations to substantiate the accuracy of the obtained results. Some potential directions for analogous further research on the subject of the present investigation are indicated in the concluding section.

Acknowledgement

The authors are thankful to the Deanship of Graduate Studies and Scientific Research at University of Bisha for supporting this work through the Fast-Tract Research Support Program.

  1. Communicated by Tomasz Natkaniec

References

[1] Agarwal, R.—Kumar, N.—Parmar, R. K.—Purohit, S. D.: Some families of the general Mathieu-type series with associated properties and functional inequalities, Math. Methods Appl. Sci. 45 (2022), 2132–2150.10.1002/mma.7913Search in Google Scholar

[2] Ali, S.—Mubeen, S.—Ali, R. S.—Rahman, G.—Morsy, A.—Nisar, K. S.—Purohit, S. D.—Zakarya, M.: Dynamical significance of generalized fractional integral inequalities via convexity, AIMS Math. 6 (2021), 9705–9730.10.3934/math.2021565Search in Google Scholar

[3] Alzer, H.: On some inequalities for the incomplete gamma function, Math. Comp. 66 (1997), 771–778.10.1090/S0025-5718-97-00814-4Search in Google Scholar

[4] Apelblat, A.: Volterra Functions, Nova Science Publ. Inc., New York, 2008.Search in Google Scholar

[5] Apelblat, A.: Integral Transforms and Volterra Functions, Nova Science Publ. Inc., New York, 2010.Search in Google Scholar

[6] Apelblat, A.: Some integrals of gamma, polygamma and Volterra functions, IMA J. Appl. Math. 34 (1985), 173–186.10.1093/imamat/34.2.173Search in Google Scholar

[7] Barry, D. A.—Parlange, J.-Y.—Li, L.: Approximation of the exponential integral (Theis Well function), J. Hydrol. 227 (2000), 287–291.10.1016/S0022-1694(99)00184-5Search in Google Scholar

[8] Hopf, E.: Mathematical Problems of Radiative Equilibrium, Cambridge Tracts in Mathematics and Mathematical Physics, Vol. 31, Cambridge University Press, London, 1934.Search in Google Scholar

[9] Erdélyi, A.—Magnus, W.—Oberhettinger, F.—Tricomi, F. G.: Tables of Integral Transforms, Vol. 1, McGraw-Hill, New York, 1954.Search in Google Scholar

[10] Erdélyi, A.—Magnus, W.—Oberhettinger, F.—Tricomi, F. G.: Higher Transcendental Functions, McGraw-Hill, New York, (1955), 217–227.Search in Google Scholar

[11] Landau, E.: Über einige ältere Vermutungen und Behauptungen in der Primzahlentheorie, Math. Z. 1 (1918), 1–24.10.1007/BF01203613Search in Google Scholar

[12] Mathai, A. M.—Saxena, R. K.—Haubold, H. J.: The H-Functions: Theory and Applications, Springer, 2010.10.1007/978-1-4419-0916-9Search in Google Scholar

[13] Gautschi, W.: Some elementary inequalities relating to the gamma and incomplete gammafunction, J. Math. Phys. 38 (1959), 77–81.10.1002/sapm195938177Search in Google Scholar

[14] Gradshteyn, I. S.—Ryzhik, I. M.: Table of Integrals, Series, and Products, Corrected and Enlarged, Academic, New York, 1980.Search in Google Scholar

[15] Hardy, G. H.: Ramanujan: Twelve Lectures on Subjects Suggested by his Life and Work, Chelsea Publ. Co., New York, 1959.Search in Google Scholar

[16] El Kamel, J.—Mehrez, K.: A function class of strictly positive definite and logarithmically completely monotonic functions related to the modified Bessel functions, Positivity 22 (2018), 1403–1417.10.1007/s11117-018-0584-3Search in Google Scholar

[17] Madland, D. G.—Nix, J. R.: New calculation of prompt fission neutron spectra and average prompt neutron multiplicities, Nucl. Sci. Eng. 81 (1982), 213–271.10.13182/NSE82-5Search in Google Scholar

[18] Mehrez, K.: Positivity of certain classes of functions related to the Fox H-functions with applications, Anal. Math. Phys. 11 (2021), Art. No. 114.10.1007/s13324-021-00553-wSearch in Google Scholar

[19] Mehrez, K.: Some geometric properties of a class of functions related to the Fox-Wright functions, Banach J. Math. Anal. 14 (2020), 1222–1240.10.1007/s43037-020-00059-wSearch in Google Scholar

[20] Mehrez, K.: New Integral representations for the Fox-Wright functions and its applications, J. Math. Anal. Appl. 468 (2018), 650–673.10.1016/j.jmaa.2018.08.053Search in Google Scholar

[21] Mehrez, K.—Sitnik, S. M.: Generalized Volterra functions, its integral representations and applications to the Mathieu-type series, Appl. Math. Comput. 347 (2019), 578–589.10.1016/j.amc.2018.11.004Search in Google Scholar

[22] Mehrez, K.—Sitnik, S. M.: Monotonicity properties and functional inequalities for the Volterra and incomplete Volterra functions, Integral Transforms Spec. Funct. 29 (2018), 875–892.10.1080/10652469.2018.1512107Search in Google Scholar

[23] Mitrinović, D. S.: Analytic Inequalities, Springer-Verlag, Berlin, 1970.10.1007/978-3-642-99970-3Search in Google Scholar

[24] Mitrinović, D. S.—Pecarić, J. E.—Fink, A. M.: Classical and New Inequalities in Analysis, Kluwer Academic Publishers, 1993.10.1007/978-94-017-1043-5Search in Google Scholar

[25] Parmar, R. K.—Agarwal, R.—Kumar, N.—Purohit, S. D.: Extended elliptic-type integrals with associated properties and Turán-type inequalities, Adv. Difference Equ. 2021 (2021), Art. No. 381.10.1186/s13662-021-03536-0Search in Google Scholar

[26] Pecarić, J. E.—Proschan, F.—Tong, Y. L.: Convex Functions, Partial Orderings, and Statistical Applications. Math. Sci. Eng., Vol. 187, Academic Press, 1992.Search in Google Scholar

[27] Selvakumaran, K. A.—Rajaguru, P.—Purohit, S. D.—Suthar, D. L: Certain geometric properties of the canonical Weierstrass product of an entire function associated with conic domains, J. Funct. Spaces 2022 (2022), Art. ID 2876673.10.1155/2022/2876673Search in Google Scholar

[28] Srivastava, H. M.—Mehrez, K.—Tomovski, Z.: New inequalities for some generalized Mathieu type series and the Riemann zeta function, J. Math. Inequal. 12 (2018), 163–174.10.7153/jmi-2018-12-13Search in Google Scholar

[29] Srivastava, H. M.—Kumar, A.—Das, S.—Mehrez, K.: Geometric properties of a certain class of Mittag–Leffler-type functions, Fractal Fract. 6 (2022), Art. No. 54.10.3390/fractalfract6020054Search in Google Scholar

[30] Touchard, J.: Sur la fonction gamma, Bull. Soc. Math. France 41 (1913), 234–242.10.24033/bsmf.930Search in Google Scholar

[31] Volterra, V.: Theoria delle potenze, dei logaritmi e delle funzioni di composizione, R. Acc. dei Lincei, Mem., ser. 5a. 11 (1916).Search in Google Scholar

[32] Widder, D. V.: The Laplace Transform, Princeton University Press, Princeton, 1946.Search in Google Scholar

Received: 2023-02-08
Accepted: 2023-09-15
Published Online: 2024-05-24
Published in Print: 2024-04-25

© 2024 Mathematical Institute Slovak Academy of Sciences

Downloaded on 24.9.2025 from https://www.degruyterbrill.com/document/doi/10.1515/ms-2024-0028/html
Scroll to top button