International Journal of Combinatorics

Volume 2009, Article ID 520923, 5 pages

http://dx.doi.org/10.1155/2009/520923

## ZPC Matrices and Zero Cycles

^{1}Department of Mathematics and Statistics, Georgia State University, Atlanta, GA 30303-3083, USA^{2}Department of Mathematics and Computer Science, Indiana State University, Terre Haute, IN 47809, USA

Received 11 December 2008; Accepted 19 March 2009

Academic Editor: Christos Koukouvinos

Copyright © 2009 Marina Arav et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

#### Abstract

Let *PHQ* is a row ZPC matrix and a column ZPC matrix.