Quasi-Symmetric Designs

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September 2007



This is the first exposition of the theory of quasi-symmetric designs, that is, combinatorial designs with at most two block intersection numbers. The authors aim to bring out the interaction among designs, finite geometries, and strongly regular graphs. The book starts with basic, classical material on designs and strongly regular graphs and continues with a discussion of some important results on quasi-symmetric designs. The later chapters include a combinatorial construction of the Witt designs from the projective plane of order four, recent results dealing with a structural study of designs resulting from Cameron's classification theory on extensions of symmetric designs, and results on the classification problem of quasi-symmetric designs. The final chapter presents connections to coding theory.


Preface; 1. Basic results from designs; 2. Strongly regular graphs and partial geometries; 3. Basic results on quasi-symmetric designs; 4. Some configurations related to strongly regular graphs and quasi-symmetric designs; 5. Strongly regular graphs with strongly regular decompositions; 6. The Witt designs; 7. Extensions of symmetric designs; 8. Quasi-symmetric 2-designs; 9. Towards a classifications of quasi-symmetric 3-designs; 10. Codes and quasi-symmetric designs; References; Index.


"...researchers in design theory should find this monograph to be a valuable resource." A.R. Calderbank, Bulletin of the American Mathematical Society "The authors have done a thorough job of surveying the literature up to the time they wrote the book." Sylvia A. Hobart, Mathematical Reviews
EAN: 9780521414074
ISBN: 0521414075
Untertitel: 'London Mathematical Society Le'. New. Sprache: Englisch.
Erscheinungsdatum: September 2007
Seitenanzahl: 244 Seiten
Format: kartoniert
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