Author:
Kruc Renata Vlahović, ,Krčadinac Vedran,
Abstract
A design is called quasi-symmetric if it has only two block intersection numbers.
Using a method based on orbit matrices, we classify quasi-symmetric \(2\)-\((28,12,11)\)
designs with intersection numbers \(4\), \(6\), and an automorphism of order \(5\). There
are exactly \(31\,696\) such designs up to isomorphism.
Publisher
University of Zagreb, Faculty of Science, Department of Mathematics