Allen Downey Books

Physical modeling in MATLAB

By Allen B. Downey

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The Little Book Of Semaphores (2nd Edition): The Ins And Outs Of Concurrency Control And Common Mistakes

By Allen Downey, Allen B. Downey

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The Little Book of Semaphores is a textbook that introduces the principles of synchronization for concurrent programming. In most computer science curricula, synchronization is a module in an Opera...

Learning PERL the Hard Way

By Allen B. Downey

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How to think like a computer scientist C version

By Allen B. Downey

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How to think like a computer scientist

By Allen B. Downey

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Think complexity

By Allen B. Downey

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Think Python

By Allen Downey

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Think Stats Exploratory Data Analysis

By Allen B. Downey

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Think Java

By Chris Mayfield, Allen Downey, Allen B. Downey, Allen B. Downey, Chris Mayfield

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If you want to under computer science, but have no programming experience, this book is for you. Think Java starts with the most basic programming concepts and carefully defines every term when it’...

Think DSP: Digital Signal Processing In Python

By Allen Downey, Allen B. Downey

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If you understand basic mathematics and know how to program with Python, you’re ready to dive into signal processing. While most resources start with theory to teach this complex subject, this prac...

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.