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COMBINATORICS
2006
112views more  COMBINATORICS 2006»
14 years 9 months ago
More Forbidden Minors for Wye-Delta-Wye Reducibility
A graph is Y Y reducible if it can be reduced to isolated vertices by a sequence of series-parallel reductions and Y Y transformations. It is still an open problem to characterize...
Yaming Yu
CSDA
2007
115views more  CSDA 2007»
14 years 9 months ago
Algorithms for compact letter displays: Comparison and evaluation
Multiple pairwise comparisons are one of the most frequent tasks in applied statistics. In this context, letter displays may be used for a compact presentation of results of multi...
Jens Gramm, Jiong Guo, Falk Hüffner, Rolf Nie...
CSCLP
2007
Springer
15 years 3 months ago
A Global Filtration for Satisfying Goals in Mutual Exclusion Networks
We formulate a problem of goal satisfaction in mutex networks in this paper. The proposed problem is motivated by problems that arise in concurrent planning. For more efficient sol...
Pavel Surynek
MP
2006
81views more  MP 2006»
14 years 9 months ago
Almost all webs are not rank-perfect
Graphs with circular symmetry, called webs, are relevant w.r.t. describing the stable set polytopes of two larger graph classes, quasi-line graphs [8,12] and claw-free graphs [7,8]...
Arnaud Pêcher, Annegret Wagler
ER
2009
Springer
92views Database» more  ER 2009»
15 years 4 months ago
On Matrix Representations of Participation Constraints
Abstract. We discuss the existence of matrix representations for generalised and minimum participation constraints which are frequently used in database design and conceptual model...
Sven Hartmann, Uwe Leck, Sebastian Link