Horst Martini Books

The book deals with the combinatorial geometry of convex bodies in finite-dimensional spaces. A general introduction to geometric convexity is followed by the investigation of d-convexity and H-con...

Geometric Methods and Optimization Problems

By V. Soltan, Horst Martini, Vladimir Boltyanski

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Circles Spheres and Spherical Geometry

By Hiroshi Maehara, Horst Martini

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Convexity from the Geometric Point of View

By Ralph Teixeira, Vitor Balestro, Horst Martini

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Excursions into Combinatorial Geometry

By Horst Martini, Vladimir Boltyanski, P. S. Soltan

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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.