On the Fourier Spectrum of Symmetric Boolean Functions with Applications to Learning Symmetric Juntas

  • Authors:
  • Richard J. Lipton;Evangelos Markakis;Aranyak Mehta;Nisheeth K. Vishnoi

  • Affiliations:
  • Georgia Institute of Technology;Georgia Institute of Technology;Georgia Institute of Technology;IBM India Research Lab

  • Venue:
  • CCC '05 Proceedings of the 20th Annual IEEE Conference on Computational Complexity
  • Year:
  • 2005

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Abstract

We study the following question: What is the smallest t such that every symmetric boolean function on k variables (which is not a constant or a parity function), has a non-zero Fourier coefficient of order at least 1 and at most t? We exclude the constant functions for which there is no such t and the parity functions for which t has to be k. Let t(k) be the smallest such t. The main contribution of this paper is a proof of the following self similar nature of this question: If t (l) 驴 s, then for any 驴 0 and for k 驴 k_0(l, 驴), t(k) 驴 (\frac{{s + 1}}{{\iota+ 1}} + \varepsilon )k