James Callahan Books

The Geometry of Spacetime: An Introduction to Special and General Relativity

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"In 1905, Albert Einstein offered a revolutionary theoryspecial relativity - to explain some of the most troubling problems in current physics concerning electromagnetism and motion. Soon afterward...

The Lighter Side of Golf

By James Callahan

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Calculus in Context Part I

By James Callahan

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Calculus in Context Part II

By James Callahan

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Calculus in context

By James Morton Callahan

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Primitivist piety

By James Patrick Callahan

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The Geometry of Spacetime

By James J. Callahan

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In 1905, Albert Einstein offered a revolutionary theory - special relativity - to explain some of the most troubling problems in current physics concerning electromagnetism and motion. Soon afterwa...

Advanced calculus

By James Callahan

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Calculus in Context

By James Callahan

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Rotting in Dirtville

By James Callahan

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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.