ON THE GALOIS GROUP OF ITERATE POLYNOMIALS

  • 발행 : 2009.08.31

초록

Let f(x) = $x^n\;+\;a$ be a binomial polynomial in Z[x] and $f_m(x)$ be the m-th iterate of f(x). In this work we study a necessary condition to be the Galois group of $f_m(x)$ is isomorphic to a wreath product group $[C_n]^m$ where $C_n$ is a cyclic group of order n.

키워드

참고문헌

  1. W. A. Beyer & J. D. Louck: Galois groups for polynomials related to quadratic map iterates. Ulam Quart. 2 (1994), no. 3, 1-39.
  2. J. E. Cremona: On the Galois groups of the iterates of $x^2$ + 1. Mathematika 36 (1989), 259-261. https://doi.org/10.1112/S0025579300013127
  3. L. Danielson: The Galois theory of iterated binomials. Ph.D. Thesis, Oregon state university, 1995.
  4. L. Danielson & B. Fein: On the irreducibility of the iterates of $x^n$ - b. Proc. Amer. Math. Soc. 130 (2001), 1589-1596. https://doi.org/10.1090/S0002-9939-01-06258-X
  5. S. Lang: Algebra. 3rd. Addison-Wesley, Reading, 1993.
  6. R. W. K. Odoni: The Galois theory of iterates and composites of polynomials. Proc. London Math. Soc. 51 (1985), 385-414. https://doi.org/10.1112/plms/s3-51.3.385
  7. R. W. K. Odoni : Realising wreath products of cyclic groups as Galois groups. Mathematika 35 (1988), 101-113. https://doi.org/10.1112/S002557930000632X
  8. H. E. Rose: A course in number theory, 2nd ed. Oxford Science Publications, 1994.
  9. M. Stoll: Galois groups over Q of some iterated polynomials. Arch. Math. 59 (1992), 239-244. https://doi.org/10.1007/BF01197321