Helmut Friedrich Books

Learning and Instruction: v. 2. 1 & 2. 2 in 1v: European Research in an International Context - Conference Proceedings

By Heinz Mandl, Erik De Corte, Helmut Friedrich, Neville Bennett

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Canyon Country Destination Guides

By Witold Sartorius, Helmut Friedrich

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Grand Canyon

By Books International Windsor, Helmut Friedrich

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Canonical gravity

By W.E. Heraeus Seminar 117th 1993 Bad Honnef Germany

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The search for a quantum gravity theory, a theory expected to combine the principles of general relativity and quantum theory, has led to some of the most deepest and most difficult conceptual and...

The Conformal Structure of Space Times

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Causal relations, and with them the underlying null cone or conformal structure, form a basic ingredient in all general analytical studies of asymptotically flat space-time. The present book review...

Canonical Gravity From Classical to Quantum

By Jurgen Ehlers, Helmut Friedrich

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Traumziel Amerika. Grand Canyon.

By Christian Heeb, Helmut Friedrich

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The Einstein Equations and the Large Scale Behavior of Gravitational Fields

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Einstein Equations and the Large Scale Behavior of Gravitational Fields

By Helmut Friedrich, Piotr T Chrusciel

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Traumziel Amerika. Canyonland. Las Vegas und das Colorado Plateau.

By Witold Sartorius, Christian Heeb, Helmut Friedrich

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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.