Some Discrete Inequalities for Convex Functions Defined on Linear Spaces

Authors

  • Silvestru Sever Dragomir Applied Mathematics Research Group, ISILC, Victoria University, PO Box 14428, Melbourne City, Australia, School of Computer Science & Applied Mathematics, University of the Witwatersrand, Private Bag 3, Johannesburg 2050, South Africa https://orcid.org/0000-0003-2902-6805

DOI:

https://doi.org/10.62298/advmath.28

Keywords:

Convex functions, Linear spaces, Jensen's inequality, Hermite-Hadamard inequality, Norm inequalities

Abstract

The following inequality is the well-known Hermite-Hadamard integral inequality for convex functions defined on a segment

[a,b]:={(1-t)a+tb,t{\displaystyle \in }[0,1]}

with a; b vectors in a linear space X;

In this paper we provide some discrete inequalities related to the Hermite-Hadamard result for convex functions defined on convex subsets in a linear space. Applications for norms and univariate real functions with an example for the logarithm, are also given.

References

[1] S.S. Dragomir and C.E.M. Pearce, Selected Topics on Hermite-Hadamard Inequalities and Applications, RGMIA Monographs, Victoria University, (2000). [Web]

[2] P. Kórus, An extension of the Hermite–Hadamard inequality for convex and s-convex functions, Aequat. Math., 93 (2019), 527-534. [CrossRef] [Scopus] [Web of Science]

[3] C.P. Niculescu, The Hermite–Hadamard inequality for convex functions on a global NPC space, J. Math. Anal. Appl., 356(1) (2009), 295-301. [CrossRef] [Scopus] [Web of Science]

[4] S. Özcan and İ. İşccan, Some new Hermite–Hadamard type inequalities for s-convex functions and their applications, J. Inequal. Appl., 2019(2019), 201. [CrossRef] [Scopus] [Web of Science]

[5] S.S. Dragomir, An inequality improving the first Hermite-Hadamard inequality for convex functions defined on linear spaces and applications for semi-inner products, J. Inequal. Pure Appl. Math., 3(2) (2002), Article 31. [Web]

[6] S.S. Dragomir, An inequality improving the second Hermite-Hadamard inequality for convex functions defined on linear spaces and applications for semi-inner products, J. Inequal. Pure Appl. Math., 3(3) (2002), Article 35. [Web]

[7] I. Ciorănescu, Geometry of Banach Spaces, Duality Mappings and Nonlinear Problems, Kluwer Academic Publishers, Dordrecht, (1990). [CrossRef]

[8] S.S. Dragomir, Semi-Inner Products and Applications, Nova Science Publishers, Inc., Hauppauge, NY, 2004. x+222 pp. ISBN: 1-59033-947-9. [Web]

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Published

30.06.2025

How to Cite

Dragomir, S. S. (2025). Some Discrete Inequalities for Convex Functions Defined on Linear Spaces. Advances in Analysis and Applied Mathematics, 2(1), 21–31. https://doi.org/10.62298/advmath.28