Basis Collapse in Holographic Algorithms

  • Authors:
  • Jin-Yi Cai;Pinyan Lu

  • Affiliations:
  • Computer Sciences Department, University of Wisconsin, Madison, USA 53706;Department of Computer Sc. & Tech., Tsinghua University, Beijing, P. R. China 100084

  • Venue:
  • Computational Complexity
  • Year:
  • 2008

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Abstract

Holographic algorithms are a novel approach to design polynomial time computations using linear superpositions. Most holographic algorithms are designed with basis vectors of dimension 2. Recently Valiant showed that a basis of dimension 4 can be used to solve in P an interesting (restrictive SAT) counting problem mod 7. This problem without modulo 7 is #P-complete, and counting mod 2 is NP-hard.We give a general collapse theorem for bases of dimension 4 to dimension 2 in the holographic algorithms framework. We also define an extension of holographic algorithms to allow more general support vectors. Finally we give a Basis Folding Theorem showing that in a natural setting the support vectors can be simulated by bases of dimension 2.