A new characterization of dual bases in finite fields and its applications

  • Authors:
  • Wei Cao;Qi Sun

  • Affiliations:
  • Department of Mathematics, Shanghai Jiaotong University, Shanghai 200240, PR China and Department of Mathematics, Sichuan University, Chengdu 610064, PR China;Department of Mathematics, Sichuan University, Chengdu 610064, PR China

  • Venue:
  • Discrete Applied Mathematics
  • Year:
  • 2007

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Abstract

We propose a new characterization of dual bases in finite fields. Let A=(@a"1,...,@a"n) be a basis of F over F"q and its dual basis B=(@b"1,...,@b"n) with the transition matrix C@?GL"n(F"q) such that (@b"1,...,@b"n)=(@a"1,...,@a"n)C. We show that T"k^T=C^-^1T"kC holds for all 1=