Rational approximation of maximal commutative subgroups of \({GL(n,\mathbb{R})}\)

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Abstract

How to find “best rational approximations” of maximal commutative subgroups of \({GL(n,\mathbb{R})}\)? In this paper we specify this problem and make first steps in its study. It contains the classical problems of Diophantine and simultaneous approximation as particular subcases but in general is much wider. We prove estimates for n = 2 for both totally real and complex cases and give an algorithm to construct best approximations of a fixed size. In addition we introduce a relation between best approximations and sails of cones and interpret the result for totally real subgroups in geometric terms of sails.

Mathematics Subject Classification (2010)

11J13 11K60 11J70 

Keywords

Maximal commutative subgroups centralizers Diophantine approximation Markov–Davenport forms sails of simplicial cones 
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© Springer Basel AG 2010

Authors and Affiliations

  1. 1.TU GrazGrazAustria
  2. 2.St. Petersburg Department of Steklov Institute of MathematicsSt. PetersburgRussia

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