Manis Valuations and Prufer Extensions II

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Manis Valuations and Prufer Extensions II

مُساهمة من طرف aRET في الأحد يناير 14, 2018 8:32 pm

Manis Valuations and Prufer Extensions II By Tobias Kaiser, Manfred Knebusch
2014 | 206 Pages | ISBN: 3319032119 | PDF | 3 MB

This volume is a sequel to "Manis Valuation and Prufer Extensions I," LNM1791. The Prufer extensions of a commutative ring A are roughly those commutative ring extensions R / A, where commutative algebra is governed by Manis valuations on R with integral values on A. These valuations then turn out to belong to the particularly amenable subclass of PM (=Prufer-Manis) valuations. While in Volume I Prufer extensions in general and individual PM valuations were studied, now the focus is on families of PM valuations. One highlight is the presentation of a very general and deep approximation theorem for PM valuations, going back to Joachim Grater's work in 1980, a far-reaching extension of the classical weak approximation theorem in arithmetic. Another highlight is a theory of so called "Kronecker extensions," where PM valuations are put to use in arbitrary commutative ring extensions in a way that ultimately goes back to the work of Leopold Kronecker.
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