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CROSSED PRODUCT ORDERS OVER VALUATION RINGS

Published online by Cambridge University Press:  23 October 2001

JOHN S. KAUTA
Affiliation:
Department of Mathematics, Faculty of Science, Universiti Brunei Darussalam, Bandar Seri Begawan 2028, Brunei; kauta@fos.ubd.edu.bn
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Abstract

Let V be a commutative valuation domain of arbitrary Krull-dimension (rank), with quotient field F, and let K be a finite Galois extension of F with group G, and S the integral closure of V in K. If, in the crossed product algebra K [midast ] G, the 2-cocycle takes values in the group of units of S, then one can form, in a natural way, a ‘crossed product order’ S [midast ] GK [midast ] G. In the light of recent results by H. Marubayashi and Z. Yi on the homological dimension of crossed products, this paper discusses necessary and/or sufficient valuation-theoretic conditions, on the extension K/F, for the V-order S [midast ] G to be semihereditary, maximal or Azumaya over V.

Type
NOTES AND PAPERS
Copyright
© The London Mathematical Society 2001

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