30 search results - page 3 / 6 » Homomorphisms and Polynomial Invariants of Graphs |
EJC
2008
13 years 5 months ago
2008
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...
WG
2005
Springer
13 years 11 months ago
2005
Springer
The Tutte polynomial is a notoriously hard graph invariant, and efficient algorithms for it are known only for a few special graph classes, like for those of bounded tree-width. Th...
ICALP
2009
Springer
14 years 6 months ago
2009
Springer
We introduce a generic approach for counting subgraphs in a graph. The main idea is to relate counting subgraphs to counting graph homomorphisms. This approach provides new algori...
FOCS
2008
IEEE
14 years 7 days ago
2008
IEEE
The deletion–contraction algorithm is perhaps the most popular method for computing a host of fundamental graph invariants such as the chromatic, flow, and reliability polynomi...
JGT
2008
13 years 5 months ago
2008
A homomorphism from an oriented graph G to an oriented graph H is a mapping from the set of vertices of G to the set of vertices of H such that ----(u)(v) is an arc in H whenever...