A Complexity Dichotomy for Partition Functions with Mixed Signs
A Complexity Dichotomy for Partition Functions with Mixed Signs
复制标题
混合符号配分函数的复杂度二分法
DOI:
10.1137/090757496
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发表时间:
2010
影响因子:
1.6
通讯作者:
Goldberg L
中科院分区:
文献类型:
--
作者:
Goldberg L
Partition functions, also known ashomomorphism functions, form a rich family of graph invariants that contain combinatorial invariants such as the number ofk-colorings or the number of independent sets of a graph and also the partition functions of certain “spin glass” models of statistical physics such as the Ising model. Building on earlier work by Dyer and Greenhill [Random Structures Algorithms, 17 (2000), pp. 260–289] and Bulatov and Grohe [Theoret. Comput. Sci., 348 (2005), pp. 148–186], we completely classify the computational complexity of partition functions. Our main result is a dichotomy theorem stating that every partition function is either computable in polynomial time or #P-complete. Partition functions are described by symmetric matrices with real entries, and we prove that it is decidable in polynomial time in terms of the matrix whether a given partition function is in polynomial time or #P-complete. While in general it is very complicated to give an explicit algebraic or combinatorial description of the tractable cases, for partition functions described by Hadamard matrices (these turn out to be central in our proofs) we obtain a simple algebraic tractability criterion, which says that the tractable cases are those “representable” by a quadratic polynomial over the field.
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影响因子:
3.9
作者:
M. Freedman;L. Lovász;A. Schrijver
通讯作者:
M. Freedman;L. Lovász;A. Schrijver
DOI:
--
发表时间:
2002
期刊:
Symposium on the Theory of Computing
影响因子:
--
作者:
L. A. Goldberg;S. Kelk;M. Paterson
通讯作者:
M. Paterson
DOI:
--
发表时间:
2008
期刊:
European journal of combinatorics (Print)
影响因子:
--
作者:
L. Lovász;A. Schrijver
通讯作者:
A. Schrijver
DOI:
10.1145/1374376.1374488
发表时间:
2008
期刊:
Proceedings of the fortieth annual ACM symposium on Theory of computing
影响因子:
--
作者:
L. Barto;M. Kozik;T. Niven
通讯作者:
T. Niven
DOI:
10.1007/978-3-540-73420-8_69
发表时间:
2007
期刊:
ArXiv
影响因子:
--
作者:
Markus Bläser;Holger Dell
通讯作者:
Holger Dell