Quadrangularity and Strong Quadrangularity in Tournaments

Details Quadrangularity and Strong Quadrangularity in Tournaments Quadrangularity and Strong Quadrangularity in Tournaments

2004-09-24

arxiv.org/abs/math/0409474v1

Australasian Journal of Combinatorics, vol.34, p.247, 2005

Mathematics

Combinatorics

12 pages

Scientific paper

The pattern of a matrix M is a (0,1)-matrix which replaces all non-zero entries of M with a 1. A directed graph is said to support M if its adjacency matrix is the pattern of M. If M is an orthogonal matrix, then a digraph which supports M must satisfy a condition known as quadrangularity. We look at quadrangularity in tournaments and determine for which orders quadrangular tournaments exist. We also look at a more restrictive necessary condition for a digraph to support an orthogonal matrix, and give a construction for tournaments which meet this condition.

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