Knebusch, Manfred; Zhang, Digen

Convexity, valuations and Prüfer extensions in real algebra

Doc. Math., J. DMV 10, 1-109 (2005)


Summary: 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

13J30, 13A18, 13F05


valuation, Prüfer extension, real holomorphy ring, convex subring