Richard Candy Books

Puzzle Box, Volume 1

By Peter Grabarchuk, Donald Knuth, Tanya Grabarchuk, Harry Nelson, Serhiy Grabarchuk, Peter Grabachuk, Ed Pegg Jr., Andrea Gilbert, Helen Grabarchuk, Bram Cohen, Richard Candy, Erich Friedman, Shelly Hazzard

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These And Almost 300 Other Mathematical Puzzles Appear In This Original Collection, Devised By World-renowned Mathematicians, Puzzle Creators, And Devoted Puzzle Lovers. A Unique Puzzle Project, It...

Puzzle Box, Volume 2

By Peter Grabarchuk, Hasan Yurtoğlu, Donald Knuth, Tanya Grabarchuk, Gianni A. Sarcone, Suzanne Hazard, Serhiy Grabarchuk, Ed Pegg Jr., Andy Parr, Helen Grabarchuk, Richard Candy, Erich Friedman, Bogomolny, Alexander

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He who untied the Gordian knot would rule all of Asia. So goes the legend of the tricky knot of Gordius, king of Phrygia.Many had tried; many had failed, but Alexander the Great simplycut the knot...

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.