Universit?t Rostock, Rostock, Germany, DE University of Waterloo, Ontario, Canada, CA Department of Mathematics and Statistics, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4K1. e-mail: rosa@mcmaster.ca, CA
Abstract:
We introduce the notion of a symmetric graph design which is a common generalization of symmetric BIBDs and of orthogonal double covers. Revised: January 21, 1999