GC
2010
Springer
13 years 11 months ago
2010
Springer
A directed graph has a natural Z-module homomorphism from the underlying graph’s cycle space to Z where the image of an oriented cycle is the number of forward edges minus the n...
GC
2010
Springer
13 years 11 months ago
2010
Springer
A star-factor of a graph is a spanning subgraph each of whose components is a star. A graph
GC
2010
Springer
13 years 11 months ago
2010
Springer
GC
2010
Springer
13 years 11 months ago
2010
Springer
In 1966 Barnette introduced a set of graphs, called circuit graphs, which are obtained from 3-connected planar graphs by deleting a vertex. Circuit graphs and 3-connected planar g...
GC
2010
Springer
13 years 11 months ago
2010
Springer
In 1988, Seiya Negami published a conjecture stating that a graph G has a finite planar cover (i.e. a homomorphism from some planar graph onto G which maps the vertex neighbourhoo...
GC
2010
Springer
13 years 11 months ago
2010
Springer
GC
2010
Springer
13 years 11 months ago
2010
Springer
GC
2010
Springer
13 years 11 months ago
2010
Springer
Intriguing and tight sets of vertices of point-line geometries have recently been studied in the literature. In this paper, we indicate a more general framework for dealing with t...