On locally divided integral domains and CPI-overrings

Abstract

It is proved that an integral domain R is locally divided if and only if each CPI-extension of ℬ (in the sense of Boisen and Sheldon) is R-flat (equivalently, if and only if each CPI-extension of R is a localization of R). Thus, each CPI-extension of a locally divided domain is also locally divided. Treed domains are characterized by the going-down behavior of their CPI-extensions. A new class of (not necessarily treed) domains, called CPI-closed domains, is introduced. Examples include locally divided domains, quasilocal domains of Krull dimension 2, and qusilocal domains with the QQR-property. The property of being CPI-closed behaves nicely with respect to the D+M construction, but is not a local property.

Keywords

• integral domain
• prime ideal
• CPI-extension
• flat over-ring
• localization
• locally divided
• going-down
• treed
• quasilocal
• QQR-property
• Δ-domain
• D+M construction
• Krull direction.