117 search results - page 11 / 24 » Graphs with Chromatic Roots in the Interval (1, 2) |
COMBINATORICS
1999
13 years 7 months ago
1999
An orthogonal coloring of a graph G is a pair {c1, c2} of proper colorings of G, having the property that if two vertices are colored with the same color in c1, then they must hav...
TCS
2010
13 years 5 months ago
2010
: We study a variant of the path cover problem, namely, the k-fixed-endpoint path cover problem, or kPC for short. Given a graph G and a subset T of k vertices of V (G), a k-fixe...
ESA
2000
Springer
13 years 11 months ago
2000
Springer
The p-center problem is to locate p facilities on a network so as to minimize the largest distance from a demand point to its nearest facility. The p-median problem is to locate p ...
COMBINATORICS
2007
13 years 7 months ago
2007
The distinguishing number ∆(X) of a graph X is the least positive integer n for which there exists a function f : V (X) → {0, 1, 2, · · · , n−1} such that no nonidentity ...
COCOA
2007
Springer
14 years 1 months ago
2007
Springer
Abstract. We study the complexity of several coloring problems on graphs, parameterized by the treewidth t of the graph: (1) The list chromatic number χl(G) of a graph G is defin...