Richard K. Guy Books

Unsolved Problems in Number Theory

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Mathematics is kept alive by the appearance of new unsolved problems, problems posed from within mathematics itself, and also from the increasing number of disciplines where mathematics is applied....

Unsolved Problems in Geometry: Unsolved Problems in Intuitive Mathematics

By Richard K. Guy, Hallard T. Croft, Kenneth Falconer

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The Emperor s Four Treasuries

By Richard K. Guy

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Gewinnen Strategien Fur Mathematische Spiele

By Jacobs Aus Dem Engl. Ubers. Von Jacobs, Richard K. Guy, Elwyn R. Berlekamp, John H. Conway

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Combinatorial Games

By Richard K. Guy

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Winning Ways for Your Mathematical Plays, Volume 4

By Richard K. Guy, Elwyn R. Berlekamp, John H. Conway

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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.