On the Resolution Complexity of Graph Non-isomorphism
On the Resolution Complexity of Graph Non-isomorphism
复制标题
关于图非同构的解析复杂度
DOI:
10.1007/978-3-642-39071-5_6
复制
发表时间:
2013
期刊:
影响因子:
--
通讯作者:
Jacobo Torán
中科院分区:
文献类型:
--
作者:
Jacobo Torán
For a pair of given graphs we encode the isomorphism principle in the natural way as a CNF formula of polynomial size in the number of vertices, which is satisfiable if and only if the graphs are isomorphic. Using the CFI graphs from [12], we can transform any undirected graphGinto a pair of non-isomorphic graphs. We prove that the resolution width of any refutation of the formula stating that these graphs are isomorphic has a lower bound related to the expansion properties ofG. Using this fact, we provide an explicit family of non-isomorphic graph pairs for which any resolution refutation requires an exponential number of clauses in the size of the initial formula. These graphs pairs are colored with color multiplicity bounded by 4. In contrast we show that when the color classes are restricted to have size 3 or less, the non-isomorphism formulas have tree-like resolution refutations of polynomial size.
登录
查看更多内容
DOI:
--
发表时间:
2012
期刊:
Mathematik für Anwendungen
影响因子:
--
作者:
Uwe Schöning;J. Torán
通讯作者:
J. Torán
DOI:
--
发表时间:
1990
期刊:
影响因子:
--
作者:
N. Immerman;E. Lander
通讯作者:
E. Lander
DOI:
--
发表时间:
2011
期刊:
Canadian Conference on AI
影响因子:
--
作者:
Calin Anton
通讯作者:
Calin Anton
DOI:
--
发表时间:
2009
期刊:
Canadian Conference on AI
影响因子:
--
作者:
Calin Anton;L. Olson
通讯作者:
L. Olson
影响因子:
1.1
作者:
P. Beame;J. Culberson;D. Mitchell;Cristopher Moore
通讯作者:
Cristopher Moore