Swan-like results for binomials and trinomials over finite fields of odd characteristic

  • Authors:
  • B. Hanson;D. Panario;D. Thomson

  • Affiliations:
  • Department of Mathematics, University of Toronto, Toronto, Canada M5S 2E4;School of Mathematics and Statistics, Carleton University, Ottawa, Canada K1S 5B6;School of Mathematics and Statistics, Carleton University, Ottawa, Canada K1S 5B6

  • Venue:
  • Designs, Codes and Cryptography
  • Year:
  • 2011

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Abstract

Swan (Pac. J. Math. 12:1099---1106, 1962) gives conditions under which the trinomial x n + x k + 1 over $${\mathbb{F}_{2}}$$ is reducible. Vishne (Finite Fields Appl. 3:370---377, 1997) extends this result to trinomials over extensions of $${\mathbb{F}_{2}}$$ . In this work we determine the parity of the number of irreducible factors of all binomials and some trinomials over the finite field $${\mathbb{F}_{q}}$$ , where q is a power of an odd prime.