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EJC
2002
13 years 11 months ago
On Line Arrangements in the Hyperbolic Plane
Andreas W. M. Dress, Jack H. Koolen, Vincent Moult...
EJC
2002
13 years 11 months ago
Neighbourhood Graphs of Cayley Graphs for Finitely-generated Groups
In this short note the neighbourhood graph of a Cayley graph is considered. It has as nodes a symmetric generating set of a finitely-generated group . Two nodes are connected by a...
Markus Neuhauser
EJC
2002
13 years 11 months ago
Cycle Cover Ratio of Regular Matroids
A cycle in a matroid is a disjoint union of circuits. This paper proves that every regular matroid M without coloops has a set S of cycles whose union is E(M) such that every elem...
Hong-Jian Lai, Hoifung Poon
EJC
2002
13 years 11 months ago
Acute Triangulations of Polygons
In this paper, we prove the existence of acute triangulations for general polyhedral surfaces. We also show how to obtain nonobtuse subtriangulations of triangulated polyhedral sur...
Hiroshi Maehara
EJC
2002
13 years 11 months ago
Bases in Orlik-Solomon Type Algebras
The Orlik-Solomon algebra of a matroid M is the quotient of the exterior algebra on the points by the ideal (M) generated by the boundaries of the circuits of the matroid. There i...
David Forge