Parameterized Proof Complexity
Parameterized Proof Complexity
复制标题
参数化证明复杂性
DOI:
10.1007/s00037-010-0001-1
复制
发表时间:
2011
影响因子:
1.4
通讯作者:
Dantchev S
中科院分区:
文献类型:
--
作者:
Dantchev S
We propose a proof-theoretic approach for gaining evidence that certain parameterized problems are not fixed-parameter tractable. We consider proofs that witness that a given propositional formula cannot be satisfied by a truth assignment that sets at mostkvariables totrue, consideringkas the parameter (we call such a formula a parameterized contradiction). One could separate the parameterized complexity classes FPT and W[SAT] by showing that there is no fpt-bounded parameterized proof system for parameterized contradictions, i.e., that there is no proof system that admits proofs of sizef(k)nO(1)wherefis a computable function andnrepresents the size of the propositional formula. By way of a first step, we introduce the system of parameterized tree-like resolution and show that this system is not fpt-bounded. Indeed, we give a general result on the size of shortest tree-like resolution proofs of parameterized contradictions that uniformly encode first-order principles over a universe of sizen. We establish a dichotomy theorem that splits the exponential case of Riis’s complexity gap theorem into two subcases, one that admits proofs of sizef(k)nO(1)and one that does not. We also discuss how the set of parameterized contradictions may be embedded into the set of (ordinary) contradictions by the addition of new axioms. When embedded into general (DAG-like) resolution, we demonstrate that the pigeonhole principle has a proof of size 2kn2. This contrasts with the case of tree-like resolution where the embedded pigeonhole principle falls into the “non-FPT” category of our dichotomy.
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
Jianer Chen;Iyad A. Kanj y;Ge Xia
通讯作者:
Ge Xia
DOI:
10.1080/00029890.2000.12005233
发表时间:
2000
期刊:
The American Mathematical Monthly
影响因子:
--
作者:
P. Pudlák
通讯作者:
P. Pudlák
影响因子:
1.4
作者:
Søren Riis
通讯作者:
Søren Riis