On the negation-limited circuit complexity of merging

  • Authors:
  • Kazuyuki Amano;Akira Maruoka;Jun Tarui

  • Affiliations:
  • Graduate School of Information Sciences, Tohoku University, Arakami, Aoba, Sendai 980-8579, Japan;Graduate School of Information Sciences, Tohoku University, Arakami, Aoba, Sendai 980-8579, Japan;Department of Information and Communication Engineering, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan

  • Venue:
  • Discrete Applied Mathematics - Special issue: Special issue devoted to the fifth annual international computing and combinatories conference (COCOON'99) Tokyo, Japan 26-28 July 1999
  • Year:
  • 2003

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Abstract

A negation-limited circuit is a combinational circuit that consists of AND, OR gates and a limited number of NOT gates. In this paper, we investigate the complexity of negation-limited circuits. The (n,n) merging function is a function that merges two presorted binary sequences x1 ≤ ... ≤ xn and y1 ≤ . . . ≤ yn into a sequence z1 ≤ . . . ≤ z2n. We prove that the size complexity of the (n,n) merging function with t = (log2 log2 n - a) NOT gates is Θ(2an).