Alexander Prestel Books

Numbers
Numbers

By Hans Hermes, Jurgen Neukirch, Heinz Dieter Ebbinghaus, Reinhold Remmert, Friedrich Hirzebruch, Alexander Prestel, Max Koecher, Klaus Mainzer

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This is a book about numbers - all kinds of numbers, from integers to p-adics, from rationals to octonions, from reals to infinitesimals. Who first used the standard notation for Â? Why was Hamilto...

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Lectures on Formally Real Fields
Lectures on Formally Real Fields

By A. Prestel

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Absolute values and their completions - like the p-adic number fields- play an important role in number theory. Krull's generalization of absolute values to valuations made applications in other br...

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Positive Polynomials
Positive Polynomials

By Alexander Prestel

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Positivity is one of the most basic mathematical concepts. In many areas of mathematics (like analysis, real algebraic geometry, functional analysis, etc.) it shows up as positivity of a polynomial...

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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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