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COCOON
2009
Springer
14 years 4 months ago
Convex Partitions with 2-Edge Connected Dual Graphs
It is shown that for every finite set of disjoint convex polygonal obstacles in the plane, with a total of n vertices, the free space around the obstacles can be partitioned into ...
Marwan Al-Jubeh, Michael Hoffmann, Mashhood Ishaqu...
IWPEC
2004
Springer
14 years 3 months ago
Parameterized Coloring Problems on Chordal Graphs
In the precoloring extension problem (PrExt) a graph is given with some of the vertices having a preassigned color and it has to be decided whether this coloring can be extended to...
Dániel Marx
CIAC
2003
Springer
145views Algorithms» more  CIAC 2003»
14 years 3 months ago
Additive Spanners for k-Chordal Graphs
Abstract. In this paper we show that every chordal graph with n vertices and m edges admits an additive 4-spanner with at most 2n−2 edges and an additive 3-spanner with at most O...
Victor Chepoi, Feodor F. Dragan, Chenyu Yan
TAGT
1998
Springer
243views Graph Theory» more  TAGT 1998»
14 years 2 months ago
Double-Pullback Graph Transitions: A Rule-Based Framework with Incomplete Information
Reactive systems perform their tasks through interaction with their users or with other systems (as parts of a bigger system). An essential requirement for modeling such systems is...
Hartmut Ehrig, Reiko Heckel, Mercè Llabr&ea...
EJC
2008
13 years 10 months ago
Locally constrained graph homomorphisms and equitable partitions
We explore the connection between locally constrained graph homomorphisms and degree matrices arising from an equitable partition of a graph. We provide several equivalent charact...
Jirí Fiala, Daniël Paulusma, Jan Arne ...