Themistocles Rassias Books

Stability of functional equations in several variables

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The notion of stability of functional equations has its origins with S. M. Ulam, who posed the fundamental problem in 1940 and with D. H. Hyers, who gave the first significant partial solution in 1...

Old and New Aspects in Spectral Geometry MATHEMATICS AND ITS APPLICATIONS Volume 534

By Mircea Craioveanu, M. Craioveanu, M. E. Craioveanu, Themistocles M. Rassias, Mircea Puta, M. Puta

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Stability of Functional Equations in Several Variables

By Donald H. Hyers

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The notion of stability of functional equations has been an area of revision and development for the past 20 years, having its origins more than half a century ago when S. Ulam posed the fundamenta...

Survey on Classical Inequalities

By Themistocles M. Rassias

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This volume provides a study of some of the well-known inequalities in classical mathematical analysis. Subjects dealt with include: Hardy-Littlewood-type inequalities, Hardy's and Carleman's inequ...

Stability of Functional Equations in Several Variables

By D. H. Hyers, Themistocles Rassias, G. Isac

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Analytic and Geometric Inequalities and Applications

By Themistocles M. Rassias, Hari M. Srivastava

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.