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Nontrivial Galois module structure of cyclotomic fields
Author(s):
Marc
Conrad;
Daniel
R.
Replogle.
Journal:
Math. Comp.
72
(2003),
891-899.
MSC (2000):
Primary 11R33, 11R29;
Secondary 11R27, 11R18
Posted:
June 4, 2002
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Abstract:
We say a tame Galois field extension with Galois group has trivial Galois module structure if the rings of integers have the property that is a free -module. The work of Greither, Replogle, Rubin, and Srivastav shows that for each algebraic number field other than the rational numbers there will exist infinitely many primes so that for each there is a tame Galois field extension of degree so that has nontrivial Galois module structure. However, the proof does not directly yield specific primes for a given algebraic number field For any cyclotomic field we find an explicit so that there is a tame degree extension with nontrivial Galois module structure.
References:
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Additional Information:
Marc
Conrad
Affiliation:
Faculty of Technology, Southampton Institute, East Park Terrace, Southampton, S014 0YN Great Britain
Email:
marc@pension-perisic.de
Daniel
R.
Replogle
Affiliation:
Department of Mathematics and Computer Science, College of Saint Elizabeth, 2 Convent Road, Morristown, New Jersey 07960
Email:
dreplogle@cse.edu
DOI:
10.1090/S0025-5718-02-01457-6
PII:
S 0025-5718(02)01457-6
Keywords:
Swan subgroups,
cyclotomic units,
Galois module structure,
tame extension,
normal integral basis
Received by editor(s):
November 6, 2000
Received by editor(s) in revised form:
July 15, 2001
Posted:
June 4, 2002
Copyright of article:
Copyright
2002,
American Mathematical Society
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