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A Fragment of Dependence Logic Capturing Polynomial Time (1210.3321v5)
Published 11 Oct 2012 in cs.LO and cs.CC
Abstract: In this paper we study the expressive power of Horn-formulae in dependence logic and show that they can express NP-complete problems. Therefore we define an even smaller fragment D-Horn* and show that over finite successor structures it captures the complexity class P of all sets decidable in polynomial time. Furthermore we study the question which of our results can ge generalized to the case of open formulae of D-Horn* and so-called downwards monotone polynomial time properties of teams.