Document Type
Article
Publication Date
11-15-2006
Publication Title
Discrete Applied Mathematics
Abstract
We study connectivity, Hamilton path and Hamilton cycle decomposition, 4-edge and 3-vertex coloring for geometric graphs arising from pseudoline (affine or projective) and pseudocircle (spherical) arrangements. While arrangements as geometric objects are well studied in discrete and computational geometry, their graph theoretical properties seem to have received little attention so far. In this paper we show that they provide well-structured examples of families of planar and projective-planar graphs with very interesting properties. Most prominently, spherical arrangements admit decompositions into two Hamilton cycles; this is a new addition to the relatively few families of 4-regular graphs that are known to have Hamiltonian decompositions. Other classes of arrangements have interesting properties as well: 4-connectivity, 3-vertex coloring or Hamilton paths and cycles. We show a number of negative results as well: there are projective arrangements which cannot be 3-vertex colored. A number of conjectures and open questions accompany our results. © 2006 Elsevier B.V. All rights reserved.
Keywords
Circle and pseudocircle arrangement, Coloring, Connectivity, Hamilton cycle, Hamilton decomposition, Hamilton path, Line and pseudoline arrangement, Planar graph, Projective-planar graph
Volume
154
Issue
17
First Page
2470
Last Page
2483
DOI
10.1016/j.dam.2006.04.006
ISSN
0166218X
Recommended Citation
Felsner, Stefan; Hurtado, Ferran; Noy, Marc; and Streinu, Ileana, "Hamiltonicity and Colorings of Arrangement Graphs" (2006). Computer Science: Faculty Publications, Smith College, Northampton, MA.
https://scholarworks.smith.edu/csc_facpubs/248
Comments
Archived as published.