Dikran N. Dikranjan Books

Categorical structure of closure operators with applications to topology, algebra, and discrete mathematics

By Dikran N. Dikranjan

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Algebraic structure of pseudocompact groups

By Dikran N. Dikranjan

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Topological groups

By Dikran N. Dikranjan

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Categorical Structure of Closure Operators

By D. Dikranjan

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This book provides a comprehensive categorical theory of closure operators, with applications to topological and uniform spaces, groups, R-modules, fields and topological groups, as well as partial...

Algebraic structure of pseudocompact groups

By Dikran N. Dikranjan

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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.