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Original scientific paper

https://doi.org/10.3336/gm.58.2.01

Quasi-symmetric \(2\)-\((28,12,11)\) designs with an automorphism of order \(5\)

Renata Vlahović Kruc ; Department of Mathematics, Faculty of Science, University of Zagreb, Bijenička cesta 30, 10000 Zagreb, Croatia
Vedran Krčadinac ; Department of Mathematics, Faculty of Science, University of Zagreb, Bijenička cesta 30, 10000 Zagreb, Croatia


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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.

Keywords

Quasi-symmetric design, automorphism group, orbit matrices

Hrčak ID:

312008

URI

https://hrcak.srce.hr/312008

Publication date:

23.12.2024.

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