Abstract
Let be an integral domain and a semistar operation stable and of finite type on it. In this paper we define the semistar dimension (inequality) formula and discover their relations with -universally catenarian domains and -stably strong S-domains. As an application we give new characterizations of -quasi-Prüfer domains and UM domains in terms of dimension inequality formula (and the notions of universally catenarian domain, stably strong S-domain, strong S-domain, and Jaffard domains). We also extend Arnold's formula to the setting of semistar operations.
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