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The essential ideal is a Cohen-Macaulay module
Author(s):
David
J.
Green
Journal:
Proc. Amer. Math. Soc.
133
(2005),
3191-3197.
MSC (2000):
Primary 20J06;
Secondary 13C14
Posted:
May 9, 2005
MathSciNet review:
2160180
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Abstract:
Let  be a finite  -group which does not contain a rank two elementary abelian  -group as a direct factor. Then the ideal of essential classes in the mod- cohomology ring of  is a Cohen-Macaulay module whose Krull dimension is the  -rank of the centre of  . This basically answers in the affirmative a question posed by J. F. Carlson (Question 5.4 in Problems in the calculation of group cohomology, 1999).
References:
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- Alejandro Adem and R. James Milgram, The mod
 cohomology rings of rank  simple groups are Cohen-Macaulay, Prospects in topology (Princeton, NJ, 1994) (Frank Quinn, ed.), Ann. of Math. Stud., vol. 138, Princeton Univ. Press, Princeton, NJ, 1995, pp. 3-12. MR 1368650 (96m:20084) - 3.
- D. J. Benson, Polynomial invariants of finite groups, London Math. Soc. Lecture Note Series, vol. 190, Cambridge University Press, Cambridge, 1993. MR 1249931 (94j:13003)
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- 8.
- -, Problems in the calculation of group cohomology, Computational methods for representations of groups and algebras (Essen, 1997) (P. Dräxler, G. O. Michler, and C. M. Ringel, eds.), Birkhäuser, Basel, 1999, pp. 107-120.MR 1714605 (2001i:20111)
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- 10.
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- Moss E. Sweedler, Hopf algebras, Mathematics Lecture Note Series, W. A. Benjamin, Inc., New York, 1969. MR 0252485 (40:5705)
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Additional Information:
David
J.
Green
Affiliation:
Department of Mathematics, University of Wuppertal, D-42097 Wuppertal, Germany
Email:
green@math.uni-wuppertal.de
DOI:
10.1090/S0002-9939-05-07887-1
PII:
S 0002-9939(05)07887-1
Received by editor(s):
February 27, 2004
Received by editor(s) in revised form:
June 24, 2004
Posted:
May 9, 2005
Communicated by:
Paul Goerss
Copyright of article:
Copyright
2005,
American Mathematical Society
The copyright for this article reverts to public domain after 28 years from publication.
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