A very simple function that requires exponential size nondeterministic graph-driven read-once branching programs

  • Authors:
  • Beate Bollig

  • Affiliations:
  • FB Informatik, LS 2, Univ. Dortmund, 44221 Dortmund, Germany

  • Venue:
  • Information Processing Letters
  • Year:
  • 2003

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Abstract

Branching programs are a well-established computation model for Boolean functions, especially read-once branching programs (BP1s) have been studied intensively. A very simple function f in n2 variables is exhibited such that both the function f and its negation ¬ f can be computed by Σ3p-circuits, the function f has nondeterministic BP1s (with one nondeterministic node) of linear size and ¬ f has size O(n4) for oblivious nondeterministic BP1s but f requires nondeterministic graph-driven BP1s of size 2Ω(n). This answers an open question stated by Jukna, Razborov, Savický, and Wegener [Comput. Complexity 8 (1999) 357-370].