All quasi-symmetric 2-(28, 12, 11) designs with an automorphism of order 7 without fixed points or blocks are enumerated. Up to isomorphism, there are exactly 246 such designs. All but four of these designs are embeddable as derived designs in symmetric 2-(64, 28, 12) designs, producing in this way
✦ LIBER ✦
A classification of all symmetric block designs of order nine with an automorphism of order six
✍ Scribed by Dean Crnković; Sanja Rukavina; Marcel Schmidt
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 123 KB
- Volume
- 14
- Category
- Article
- ISSN
- 1063-8539
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✦ Synopsis
Abstract
We complete the classification of all symmetric designs of order nine admitting an automorphism of order six. As a matter of fact, the classification for the parameters (35,17,8), (56,11,2), and (91,10,1) had already been done, and in this paper we present the results for the parameters (36,15,6), (40,13,4), and (45,12,3). We also provide information about the order and the structure of the full automorphism groups of the constructed designs. © 2005 Wiley Periodicals, Inc. J Combin Designs 14: 301–312, 2006
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