J. Keller Books

Condensed Matter Theories
Condensed Matter Theories

By J. Keller

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Density Functional Theory
Density Functional Theory

By J. Keller

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Theory of the Electron
Theory of the Electron

By J. Keller

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In the first century after its discovery, the electron has come to be a fundamental element in the analysis of physical aspects of nature. This book is devoted to the construction of a deductive th...

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Theory of the Electron
Theory of the Electron

By J. Keller

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Love Hurts
Love Hurts

By Kat Martin, Laura Florand, J. Keller

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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.

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