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July  2011, 29(3): 839-844. doi: 10.3934/dcds.2011.29.839

Maximal abelian torsion subgroups of Diff( C,0)

Kingshook Biswas 1,

1. 

Ramakrishna Mission Vivekananda University, Belur Math, WB-711202

Received  July 2009 Revised  August 2010 Published  November 2010

In the study of the local dynamics of a germ of diffeomorphism fixing the origin in $\mathbb C$, an important problem is to determine the centralizer of the germ in the group Diff$(\mathbb C,0)$ of germs of diffeomorphisms fixing the origin. When the germ is not of finite order, then the centralizer is abelian, and hence a maximal abelian subgroup of Diff$(\mathbb C,0)$. Conversely any maximal abelian subgroup which contains an element of infinite order is equal to the centralizer of that element. A natural question is whether every maximal abelian subgroup contains an element of infinite order, or whether there exist maximal abelian torsion subgroups; we show that such subgroups do indeed exist, and moreover that any infinite subgroup of the rationals modulo the integers $\mathbb{Q/Z}$ can be embedded into Diff$(\mathbb C,0)$ as such a subgroup.
Keywords: Germs of holomorphic diffeomorphisms, centralizers..
Mathematics Subject Classification: Primary: 37F5.
Citation: Kingshook Biswas. Maximal abelian torsion subgroups of Diff( C,0). Discrete & Continuous Dynamical Systems - A, 2011, 29 (3) : 839-844. doi: 10.3934/dcds.2011.29.839
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show all references

References:
[1]

I. N. Baker, Fractional iteration near a fixed point of multiplier 1,, J. Austral. Math. Soc, 4 (1964), 143. doi: 10.1017/S144678870002334X. Google Scholar

[2]

A. D. Brjuno, Analytical form of differential equations,, Transactions Moscow Math. Soc., 25 (1971), 131. Google Scholar

[3]

J. Ecalle, Théorie itérative: introduction à la théorie des invariantes holomorphes,, J. Math pures et appliqués, 54 (1975), 183. Google Scholar

[4]

J. Moser, On commuting circle mappings and simultaneous Diophantine approximations,, Math. Zeitschrift, 205 (1990), 105. doi: 10.1007/BF02571227. Google Scholar

[5]

R. Perez-Marco, Solution complète au problème de Siegel de linéarisation d'une application holomorphe au voisinage d'un point fixe (d'après J.C.Yoccoz),, Seminar Bourbaki, 34 (). Google Scholar

[6]

R. Perez-Marco, Uncountable number of symmetries for non-linearisable holomorphic dynamics,, Inventiones Mathematicae, 119 (1995), 67. doi: 10.1007/BF01245175. Google Scholar

[7]

S. M. Voronin, Analytic classification of germs of conformal mappings (C,0) $\to$ (C,0) with identity linear part,, Funktsional Anal. i Prilozhen, 16 (1982), 1. Google Scholar

[8]

J. C. Yoccoz, Petits diviseurs en dimension 1,, Asterisque, 231 (1995), 3. Google Scholar

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