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Galois scaffolding in one-dimensional elementary abelian extensions
Author:
G. Griffith Elder
Journal:
Proc. Amer. Math. Soc. 137 (2009), 1193-1203
MSC (2000):
Primary 11R33, 11S15
Posted:
October 16, 2008
MathSciNet review:
2465640
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Additional Information
Abstract: A Galois scaffold is defined to be a variant of a normal basis that allows for an easy determination of valuation and thus has implications for the questions of the Galois module structure. We introduce a class of elementary abelian -extensions of local function fields of characteristic , which we call one-dimensional and which should be considered no more complicated than cyclic degree extensions, and show that they, just as cyclic degree extensions, possess a Galois scaffold.
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structure, J. Théor. Nombres Bordeaux 17
(2005), no. 1, 87–107 (English, with English and French
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- 1.
- Akira Aiba, Artin-Schreier extensions and Galois module structure, J. Number Theory 102 (2003), no. 1, 118-124. MR 1994476 (2004f:11127)
- 2.
- Françoise Bertrandias and Marie-Josée Ferton, Sur l'anneau des entiers d'une extension cyclique de degré premier d'un corps local, C. R. Acad. Sci. Paris Sér. A-B 274 (1972), A1330-A1333. MR 0296047 (45:5108)
- 3.
- Z. I. Borevič and S. V. Vostokov, The ring of integral elements of an extension of prime degree of a local field as a Galois module, Zap. Naučn. Sem. Leningrad. Otdel. Mat. Inst. Steklov. (LOMI) 31 (1973), 24-37. MR 0330112 (48:8450)
- 4.
- Nigel P. Byott and G. Griffith Elder, New ramification breaks and additive Galois structure, J. Théor. Nombres Bordeaux 17 (2005), no. 1, 87-107, Les XXIIIièmes Journées Arithmétiques (Graz, 2003). MR 2152213 (2006b:11149)
- 5.
- -, A valuation criterion for normal bases in elementary abelian extensions, Bull. Lond. Math. Soc. 39 (2007), no. 5, 705-708. MR 2365217
- 6.
- Bart de Smit and Lara Thomas, Local Galois module structure in positive characteristic and continued fractions, Arch. Math. (Basel) 88 (2007), no. 3, 207-219. MR 2305599 (2008b:11120)
- 7.
- I. B. Fesenko and S. V. Vostokov, Local fields and their extensions, second ed., Translations of Mathematical Monographs, vol. 121, American Mathematical Society, Providence, RI, 2002. MR 1915966 (2003c:11150)
- 8.
- J-P. Serre, Local fields, Springer-Verlag, New York, 1979. MR 554237 (82e:12016)
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Additional Information
G. Griffith Elder
Affiliation:
Department of Mathematics, University of Nebraska at Omaha, Omaha, Nebraska 68182-0243
Email:
elder@unomaha.edu
DOI:
http://dx.doi.org/10.1090/S0002-9939-08-09710-4
PII:
S 0002-9939(08)09710-4
Keywords:
Ramification,
Galois module structure
Received by editor(s):
May 17, 2007
Received by editor(s) in revised form:
July 21, 2007, September 12, 2007, and April 8, 2008
Posted:
October 16, 2008
Additional Notes:
The author was partially supported by National Science Foundation Grant No. 201080.
Communicated by:
Ted Chinburg
Article copyright:
© Copyright 2008 American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication.
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