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» On Finding Acyclic Subhypergraphs
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FCT
2005
Springer
13 years 10 months ago
On Finding Acyclic Subhypergraphs
: In this paper, we investigate the problem to find an acyclic subhypergraph in a given hypergraph, which is an extension to find a tree in a graph. First, we introduce a spannin...
Kouichi Hirata, Megumi Kuwabara, Masateru Harao
ECCC
2006
112views more  ECCC 2006»
13 years 4 months ago
Faster algorithms for finding lowest common ancestors in directed acyclic graphs
We present two new methods for finding a lowest common ancestor (LCA) for each pair of vertices of a directed acyclic graph (dag) on n vertices and m edges. The first method is su...
Artur Czumaj, Miroslaw Kowaluk, Andrzej Lingas
TCS
2008
13 years 4 months ago
The NP-hardness of finding a directed acyclic graph for regular resolution
Let R be a resolution refutation, given as a sequence of clauses without explicit description of the underlying dag. Then, it is NPcomplete to decide whether R is a regular resolu...
Samuel R. Buss, Jan Hoffmann 0002
JMLR
2010
149views more  JMLR 2010»
12 years 11 months ago
Learning Bayesian Network Structure using LP Relaxations
We propose to solve the combinatorial problem of finding the highest scoring Bayesian network structure from data. This structure learning problem can be viewed as an inference pr...
Tommi Jaakkola, David Sontag, Amir Globerson, Mari...
KR
2010
Springer
13 years 9 months ago
Finding the Next Solution in Constraint- and Preference-Based Knowledge Representation Formalisms
In constraint or preference reasoning, a typical task is to compute a solution, or an optimal solution. However, when one has already a solution, it may be important to produce th...
Ronen I. Brafman, Francesca Rossi, Domenico Salvag...