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arXiv cs/0306134cs.CCcs.LO
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布尔约束同构的复杂性

The Complexity of Boolean Constraint Isomorphism

Elmar Böhler, Edith Hemaspaandra, Steffen Reith, Heribert Vollmer

摘要:

1978年,Schaefer证明了他著名的广义可满足性问题的二分法。他定义了无限多的命题可满足性问题(现在通常称为布尔约束满足问题),并表明,所有这些可满足性问题要么在P或NP完全。近年来,对于布尔约束的其他一些问题也得到了类似的结果,这些问题几乎都是可满足性问题的变形。在本文中,我们解决了一个问题,这不是一个变化的可满足性,即同构问题的布尔约束。Böhler等人先前的工作表明同构问题要么是coNP-难的,要么可简化为图同构问题(一个NP问题,但不知道是NP-难的),从而区分了困难情况和较容易的情况。然而,他们没有分类哪些情况是真正容易的,即,在P中,这篇论文正是这样做的。证明了布尔约束同构是coNP-困难的(和GI-困难的),或等价于图同构,或在P中,并给出了判断哪种情况成立的简单准则。

英文摘要:

In 1978, Schaefer proved his famous dichotomy theorem for generalized satisfiability problems. He defined an infinite number of propositional satisfiability problems (nowadays usually called Boolean constraint satisfaction problems) and showed that all these satisfiability problems are either in P or NP-complete. In recent years, similar results have been obtained for quite a few other problems for Boolean constraints.Almost all of these problems are variations of the satisfiability problem. In this paper, we address a problem that is not a variation of satisfiability, namely, the isomorphism problem for Boolean constraints. Previous work by Böhler et al. showed that the isomorphism problem is either coNP-hard or reducible to the graph isomorphism problem (a problem that is in NP, but not known to be NP-hard), thus distinguishing a hard case and an easier case. However, they did not classify which cases are truly easy, i.e., in P. This paper accomplishes exactly that. It shows that Boolean constraint isomorphism is coNP-hard (and GI-hard), or equivalent to graph isomorphism, or in P, and it gives simple criteria to determine which case holds.

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