Testing nilpotence of galois groups in polynomial time

  • Authors:
  • V. Arvind;Piyush P. Kurur

  • Affiliations:
  • Institute of Mathematical Sciences, Chennai, India;Indian Institute of Technology, Kanpur, India

  • Venue:
  • ACM Transactions on Algorithms (TALG)
  • Year:
  • 2012

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Abstract

We give the first polynomial-time algorithm for checking whether the Galois group Gal(f) of an input polynomial f(X) ∈ Q[X] is nilpotent: the running time of our algorithm is bounded by a polynomial in the size of the coefficients of f and the degree of f. Additionally, we give a deterministic polynomial-time algorithm that, when given as input a polynomial f(X) ∈ Q[X] with nilpotent Galois group, computes for each prime factor p of # Gal(f), a polynomial gp(X)∈ Q[X] whose Galois group of is the p-Sylow subgroup of Gal(f).