Alexandru Kristaly Books

Variational Principles in Mathematical Physics Geometry and Economics

By Vicentiu D. Radulescu, Alexandru Kristaly, Csaba Varga

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Variational principles in mathematical physics geometry and economics

By Alexandru Kristaly

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"This comprehensive introduction to the calculus of variations and its main principles also presents their real-life applications in various contexts: mathematical physics, differential geometry, a...

Variational Principles in Mathematical Physics Geometry and Economics

By Alexandru Kristaly, Csaba Varga, Vicen 355 Iu D. R 259 Dulescu

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Variational Principles in Mathematical Physics Geometry and Economics

By Alexandru Kristaly, Csaba Varga, Vicen 355 Iu D. R 259 Dulescu

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Variational and Monotonicity Methods in Nonsmooth Analysis

By Alexandru Kristaly, Csaba Varga, Nicusor Costea

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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.