Manis Valuations and Prüfer Extensions II - Kaiser, Tobias;Knebusch, Manfred
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This volume is a sequel to "Manis Valuation and Prüfer Extensions I," LNM1791. The Prüfer 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 (=Prüfer-Manis) valuations. While in Volume I Prüfer 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…mehr

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Produktbeschreibung
This volume is a sequel to "Manis Valuation and Prüfer Extensions I," LNM1791. The Prüfer 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 (=Prüfer-Manis) valuations. While in Volume I Prüfer 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 Gräter'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.

Autorenporträt
Dr. Tobias Kaiser hat in München, Kopenhagen, Berkeley und Chicago Volkswirtschaftslehre und Politikwissenschaft studiert und dort zu medienökonomischen Themen geforscht. Dabei hat er sich besonders mit der Regulierung des Fernsehens in Europa und den USA und mit den ökonomischen und gesellschaftlichen Wirkungen des Medienwandels beschäftigt. Derzeit berichtet er als Redakteur für "Die Welt" und die "Welt am Sonntag" aus Berlin über Konjunktur und Wirtschaftspolitik.