David Pengelley Books

Mathematical Masterpieces

By Arthur Knoebel, Jerry Lodder, David Pengelley, Reinhard Laubenbacher

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Mathematical Masterpieces

By David Pengelley, Reinhard Laubenbacher, Art Knoebel, Jerry M. Lodder

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Mathematical Expeditions: Chronicles By The Explorers

By Reinhard Laubenbacher

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Mathematical Expeditions: Chronicles by the Explorers

By David Pengelley, Reinhard Laubenbacher

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This book contains the stories of five mathematical journeys into new realms, told through the writings of the explorers themselves. Some were guided by mere curiosity and the thrill of adventure,...

Mathematical Expeditions

By David Pengelley, Reinhard Laubenbacher

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Mathematical Masterpieces

By Jerry Lodder, David Pengelley, Reinhard Laubenbacher, Art Knoebel

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Mathematical Expeditions

By David Pengelley, Reinhard Laubenbacher

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Number Theory Through the Eyes of Sophie Germain

By David Pengelley

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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.