Abstract
In this paper, we study (Schelter) integral extensions of PI-rings. We prove in particular lying over, going up, and incomparability for prime ideals. A major result is transitivity of integrality: If R⊆S⊆B are PI-rings such that B is integral over S and S is integral over R, then B is integral over R. Next, we obtain a powerful criterion for integrality: If S is a prime PI-ring such that its center is integral over a Noetherian subring R of S, then S is integral over R. This allows interesting applications to the theory of finite group actions. Further topics concern Eakin-Nagata type results and embeddings of quotient rings for integral extensions. Finally, we analyze the relationship between module-finite extensions and finitely generated integral extensions, obtaining positive results for affine Noetherian PI-algebras and algebras satisfying certain restrictions on PI-degrees (e.g., algebras of low PI-degree).
| Original language | English |
|---|---|
| Pages (from-to) | 39-79 |
| Number of pages | 41 |
| Journal | Journal of Algebra |
| Volume | 151 |
| Issue number | 1 |
| DOIs | |
| State | Published - Sep 1992 |
Bibliographical note
Funding Information:*This work was done while the first author enjoyedt he hospitalityo f the universityo f Southern California, Los Angeles. + Partially supported by NSF Grant DMS 8901491.
ASJC Scopus subject areas
- Algebra and Number Theory