Gerda Fritsch Books

The Four Color Theorem

By Rudolf Fritsch, J.Lie Peschke, Gerda Fritsch

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Four Color Theorem

By J. Lie Peschke, Rudolf Fritsch, Gerda Fritsch

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The Four-Color Theorem: History, Topological Foundations, and Idea of Proof

By Fritsch Rudolf, Rudolf Fritsch, Gerda Fritsch

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This elegant little book discusses a famous problem that helped to define the field now known as graph theory: what is the minimum number of colors required to print a map such that no two adjoinin...

Per aspera ad astra

By Rudolf Fritsch, Klaus Fessmann, Gerda Fritsch, Dietmar Graf

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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.