Real Algebraic and Analytic Geometry

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89. Manfred Knebusch, Digen Zhang:
Convexity, valuations and Prüfer extensions in real algebra.

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Submission: 2004, February 12.

We analyse the interplay between real valuations, Prüfer extensions and convexity with respect to various preorderings on a given commutative ring. We study all this first in preordered rings in general, then in $f$-rings. Most often Prüfer extensions and real valuations abound whenever a preordering is present. The next logical step, to focus on the more narrow class of real closed rings, is not yet taken, except in some examples.

Mathematics Subject Classification (2000): 13J30, 13A18, 13F05.

Keywords and Phrases: valuation, Prüfer extension, real holomorphy ring, convex subring.

Full text, 109p.: dvi 433k, ps.gz 365k, pdf 568k.

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