Razvan Gelca Books

Putnam And Beyond

By Titu Andreescu, Razvan Gelca, Rǎzvan Gelca, Rǎzvan Gelca, Titu Andreescu

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There are many books on problem solving. The majority are aimed at junior high and high school students preparing for either the International Mathematical Olympiad or national IMO selection tests...

Mathematical Olympiad Challenges

By Titu Andreescu, Razvan Gelca, Titu Andreescu, Răzvan Gelca (Auth.)

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Mathematical Olympiad Challenges is a rich collection of problems put together by two experienced and well-known professors and coaches of the U.S. International Mathematical Olympiad Team. Hundred...

Mathematical Olympiad Challenges

By Titu Andreescu, Razvan Gelca, Titu Andreescu, Răzvan Gelca (Auth.)

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Mathematical Olympiad Challenges

By Razvan Gelca, Titu Andreescu

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Mathematical Olympiad Challenges

By Razvan Gelca, Titu Andreescu

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This signficantly revised and expanded second edition of Mathematical Olympiad Challenges is a rich collection of problems put together by two experienced and well-known professors and coaches of t...

Putnam And Beyond

By Titu Andreescu, Razvan Gelca, Răzvan Gelca

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Mathematical Olympiad Challenges

By Razvan Gelca, Titu Andreescu

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Theta Functions and Knots

By Razvan Gelca, R. Gelca

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Mathematical Olympiad Challenges

By Titu Andreescu, Razvan Gelca, Mark Saul, Titu Andreescu Razvan Gelca, Titu Andreescu, Răzvan Gelca (Auth.)

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Mathematical Olympiad Challenges

By Mark Saul, Razvan Gelca, Titu Andreescu

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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.