96 search results - page 2 / 20 » New Plain-Exponential Time Classes for Graph Homomorphism |
CSR
2008
Springer
13 years 6 months ago
2008
Springer
The universal cover TG of a connected graph G is the unique (possible infinite) tree covering G, i.e., that allows a locally bijective homomorphism from TG to G. Universal covers h...
IWOCA
2010
Springer
12 years 11 months ago
2010
Springer
A homomorphism from a graph G to a graph R is locally surjective if its restriction to the neighborhood of each vertex of G is surjective. Such a homomorphism is also called an R-r...
JSYML
2010
12 years 11 months ago
2010
A set A of vertices of a graph G is called d-scattered in G if no two d-neighborhoods of (distinct) vertices of A intersect. In other words, A is d-scattered if no two distinct ver...
FOCS
2003
IEEE
13 years 10 months ago
2003
IEEE
We give a complexity theoretic classification of homomorphism problems for graphs and, more generally, relational structures obtained by restricting the left hand side structure ...
STOC
2006
ACM
14 years 4 months ago
2006
ACM
Classes of graphs with bounded expansion have been introduced in [15], [12]. They generalize both proper minor closed classes and classes with bounded degree. For any class with b...