交换环上的“下降”问题和“上升”问题
Problems of “pushdown” and “pullback” on a commutative ring
-
摘要: 本文的目的是基于域上高层序的"下降"问题与"上升"问题的有关结论,在含单位元的交换环上,通过取序的特殊化以及整环的商域,将此结论加以推广.同时指明,与一个给定的赋值对相容的所有n层序对于C-R拓扑组成Rn-SpecK的一个闭子集.Abstract: The aim of this paper is based on the conclusions concerning the problems of "pushdown" and "pullback" for an ordering of higher level on a field.We extend them by taking specialization of orderings and the quotient fields of domains on a commutative ring with unit.Moreover,it is shown that all orderings of level ncompatible with a given valuation pair on a commutative ring constitute a closed subset of Rn-SpecK for the C-Rtopology.