GC
2010
Springer
13 years 2 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 2 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 2 months ago
2010
Springer
GC
2010
Springer
13 years 2 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 2 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 2 months ago
2010
Springer
GC
2010
Springer
13 years 2 months ago
2010
Springer
GC
2010
Springer
13 years 2 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...