Richard K Guy Books

Winning Ways for Your Mathematical Plays, Vol. 2

By Elwyn R. Berlekamp

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Reviews in number theory, 1973-83, as printed in Mathematical reviews

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The Lighter Side of Mathematics

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Is mathematics inevitable

By Leonard F. Klosinski

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This is a collection of gems from the literature of mathematics that shine as brightly today as when they first appeared in print - they deserve to be seen and admired. The selections include two o...

Unsolved Problems in Geometry

By Hallard T. Croft

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Mathematicians and non-mathematicians alike have long been fascinated by geometrical problems, particularly those that are intuitive in the sense of being easy to state, perhaps with the aid of a s...

Winning Ways for Your Mathematical Plays Volume 1

By Elwyn R. Berlekamp

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Winning Ways for Your Mathematical Plays Volume 2

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Winning Ways for Your Mathematical Plays, Volume 3

By Elwyn R. Berlekamp

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This is a text on games and how to play them intelligently. In this volume, the authors examine games played in clubs, giving case studies for coin and paper-and-pencil games, such as Dots-and-Boxe...

Unsolved Problems in Number Theory

By Richard K. Guy

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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.