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EJC
2006
13 years 4 months ago
Invariant subspaces, duality, and covers of the Petersen graph
A general method for finding elementary abelian regular covering projections of finite connected graphs is applied to the Petersen graph. As a result, a complete list of pairwise ...
Aleksander Malnic, Primoz Potocnik
EJC
2006
13 years 4 months ago
Hadamard ideals and Hadamard matrices with two circulant cores
We apply Computational Algebra methods to the construction of Hadamard matrices with two circulant cores, given by Fletcher, Gysin and Seberry. We introduce the concept of Hadamar...
Ilias S. Kotsireas, Christos Koukouvinos, Jennifer...
EJC
2006
13 years 4 months ago
On the canonical metric representation, average distance, and partial Hamming graphs
Average distance of a graph is expressed in terms of its canonical metric representation. The equality can be modified to an inequality in such a way that it characterizes isometr...
Sandi Klavzar
EJC
2006
13 years 4 months ago
A note on Ramsey numbers with two parameters
1 The Ramsey number R(G1, G2) is the smallest integer p such that for any graph G on p vertices2 either G contains G1 or G contains G2, where G denotes the complement of G. In this...
Yi Ru Huang, Jian Sheng Yang, Kemin Zhang
EJC
2006
13 years 4 months ago
Hamiltonicity of digraphs for universal cycles of permutations
The digraphs P(n, k) have vertices corresponding to length k permutations of an n set and arcs corresponding to (k + 1) permutations. Answering a question of Starling, Klerlein, K...
Garth Isaak
EJC
2006
13 years 4 months ago
Homogeneous factorisations of graphs and digraphs
Michael Giudici, Cai Heng Li, Primoz Potocnik, Che...