On OBDDs for CNFs of Bounded Treewidth
On OBDDs for CNFs of Bounded Treewidth
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关于有界树宽 CNF 的 OBDD
DOI:
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发表时间:
2013
期刊:
影响因子:
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通讯作者:
Igor Razgon
中科院分区:
文献类型:
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作者:
Igor Razgon
In this paper we show that a CNF cannot be compiled into an Ordered Binary Decision Diagram (OBDD) of fixed-parameter size parameterized by the primal graph treewidth of the CNF. Thus we provide a parameterized separation between OBDDs and Sentential Decision Diagrams (SDDs) for which such fixed-parameter compilation is possible. In fact, we demonstrate that the proposed lower bound also yields a classical (non-parameterized) separation of OBDDs and SDDs. We also show that the best existing parameterized upper bound for OBDDs in fact holds for incidence graph treewidth parameterization.