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1 results

  • 9 - Soluble Approximate Subgroups of GLn(C)

  • Matthew C. H. Tointon, University of Cambridge
  • Book:
    Introduction to Approximate Groups
    Published online:
    31 October 2019
    Print publication:
    14 November 2019, pp 147-169

  • Summary

    We prove Breuillard and Green’s theorem that a finite approximate subgroup of a soluble complex linear group G of bounded degree is contained in a union of a few cosets of a nilpotent group of bounded step. We first treat the special case in which G is an upper-triangular group. An important ingredient is Solymosi’s sum-product theorem over the complex numbers, which we state and prove. We introduce some basic representation theory and use it to prove that a soluble complex linear group of bounded degree has a subgroup of bounded index that is conjugate to an upper-triangular group; this is a special case of a result of Mal’cev. We then use this to extend from the upper-triangular case to the general soluble case.