Near-Optimal expanding generator sets for solvable permutation groups

  • Authors:
  • Vikraman Arvind;Partha Mukhopadhyay;Prajakta Nimbhorkar;Yadu Vasudev

  • Affiliations:
  • The Institute of Mathematical Sciences, Chennai, India;Chennai Mathematical Institute, Siruseri, India;Chennai Mathematical Institute, Siruseri, India;The Institute of Mathematical Sciences, Chennai, India

  • Venue:
  • MFCS'12 Proceedings of the 37th international conference on Mathematical Foundations of Computer Science
  • Year:
  • 2012

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Abstract

Let G=〈S〉 be a solvable subgroup of the symmetric group Sn given as input by the generator set S. We give a deterministic polynomial-time algorithm that computes an expanding generator set of size Õ(n2) for G. As a byproduct of our proof, we obtain a new explicit construction of ε-bias spaces of size Õ$(n{\rm poly}({\rm log} d))({{1}\over{\varepsilon}})^{O(1)}$ for the groups $\mathbb{Z}_d^n$.