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Bulletin of the London Mathematical Society
Article . 2011 . Peer-reviewed
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Torsion in the Nottingham group

Authors: Jonathan Lubin;

Torsion in the Nottingham group

Abstract

From local class-field theory and higher ramification theory one gets a classification up to conjugacy of the torsion elements of arbitrary order in the Nottingham group over a finite field, in terms of continuous characters on the multiplicative group of principal units in the ring of formal power series over the field. An essential part of this classification is to partition the torsion elements according to the depths of their successive p-power iterates. The classification described here is good enough to permit an independent proof of Klopsch’s theorem on torsion elements of order p, but not good enough to give a full description of the finite set of classes of torsion elements with a given depth-sequence. The final section exhibits an efficient method of calculating the first few hundred terms of a series of order p, limited only by the capabilities of the computation package used, but gives no idea of any formula for describing the coefficients.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
7
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Average
Average
bronze