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ARSCOM
2004
75views more  ARSCOM 2004»
13 years 11 months ago
On Theorems Equivalent with Kotzig's Result on Graphs with Unique 1-Factors
We show that several known theorems on graphs and digraphs are equivalent. The list of equivalent theorems include Kotzig's result on graphs with unique 1-factors, a lemma by...
Stefan Szeider
ARSCOM
2004
73views more  ARSCOM 2004»
13 years 11 months ago
2-Factors in Hamiltonian Graphs
We show that every hamiltonian claw-free graph with a vertex x of degree d(x) 7 has a 2-factor consisting of exactly two cycles.
Florian Pfender
ARSCOM
2004
104views more  ARSCOM 2004»
13 years 11 months ago
Complete Minors in Cubic Graphs with few short Cycles and Random Cubic Graphs
We first prove that for any fixed k a cubic graph with few short cycles contains a Kk-minor. This is a direct generalisation of a result on girth by Thomassen. We then use this the...
Klas Markstrom
ARSCOM
2004
54views more  ARSCOM 2004»
13 years 11 months ago
Orthogonal Designs of Kharaghani Type: II
Christos Koukouvinos, Jennifer Seberry
ARSCOM
2004
91views more  ARSCOM 2004»
13 years 11 months ago
Edge-critical isometric subgraphs of hypercubes
All cubic partial cubes (i.e., cubic isometric subgraphs of hypercubes) up to 30 vertices and all edge-critical partial cubes up to 14 vertices are presented. The lists of graphs ...
Sandi Klavzar, Alenka Lipovec
ARSCOM
2004
76views more  ARSCOM 2004»
13 years 11 months ago
Independent sets in Steiner triple systems
A set of points in a Steiner triple system (STS(v)) is said to be independent if no three of these points occur in the same block. In this paper we derive for each k 8 a closed f...
A. D. Forbes, Mike J. Grannell, Terry S. Griggs
ARSCOM
2004
64views more  ARSCOM 2004»
13 years 11 months ago
An Upper Bound of 62 on the Classical Ramsey Number R(3, 3, 3, 3)
Susan E. Fettes, Richard L. Kramer, Stanislaw P. R...
ARSCOM
2004
56views more  ARSCOM 2004»
13 years 11 months ago
Some New 4-Designs
The existence question for the family of 4-(15, 5, ) designs has long been answered for all values of except = 2. Here, we resolve this last undecided case and prove that 4-(15, ...
Ziba Eslami, Gholamreza B. Khosrovshahi, M. Mohamm...
ARSCOM
2004
175views more  ARSCOM 2004»
13 years 11 months ago
Circular Chromatic Number of Hypergraphs
The concept of circular chromatic number of graphs was introduced by Vince(1988). In this paper we define circular chromatic number of uniform hypergraphs and study their basic pr...
Changiz Eslahchi, Arash Rafiey