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MFCS
2007
Springer
13 years 11 months ago
On Approximation of Bookmark Assignments
Consider a rooted directed acyclic graph G = (V, E) with root r, representing a collection V of web pages connected via a set E of hyperlinks. Each node v is associated with the pr...
Yuichi Asahiro, Eiji Miyano, Toshihide Murata, Hir...
MFCS
2007
Springer
13 years 11 months ago
Combinatorial Proof that Subprojective Constraint Satisfaction Problems are NP-Complete
Abstract. We introduce a new general polynomial-time constructionthe fibre construction- which reduces any constraint satisfaction problem CSP(H) to the constraint satisfaction pr...
Jaroslav Nesetril, Mark H. Siggers
MFCS
2007
Springer
13 years 11 months ago
Hardness Results for Tournament Isomorphism and Automorphism
A tournament is a graph in which each pair of distinct vertices is connected by exactly one directed edge. Tournaments are an important graph class, for which isomorphism testing ...
Fabian Wagner
MFCS
2007
Springer
13 years 11 months ago
Structural Analysis of Gapped Motifs of a String
Abstract. We investigate the structure of the set of gapped motifs (repeated patterns with don’t cares) of a given string of symbols. A natural equivalence classification is int...
Esko Ukkonen
MFCS
2007
Springer
13 years 11 months ago
What Are Iteration Theories?
Jirí Adámek, Stefan Milius, Jiri Vel...