Abelian difference sets with the symmetric difference property
| Autor: | James A. Davis, Connor Kissane, Ziming Liu, Kartikey Sharma, Yiwei Sun, Calvin Reedy, J. J. Hoo, Ken W. Smith |
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| Rok vydání: | 2021 |
| Předmět: |
Difference set
Group (mathematics) Applied Mathematics Block (permutation group theory) 020206 networking & telecommunications 0102 computer and information sciences 02 engineering and technology 01 natural sciences Computer Science Applications Combinatorics 010201 computation theory & mathematics 0202 electrical engineering electronic engineering information engineering Order (group theory) Abelian group Symmetric difference Complement (set theory) Mathematics Symplectic geometry |
| Zdroj: | Designs, Codes and Cryptography. 89:517-523 |
| ISSN: | 1573-7586 0925-1022 |
| DOI: | 10.1007/s10623-020-00829-5 |
| Popis: | A $$(v,k,\lambda )$$ symmetric design is said to have the symmetric difference property (SDP) if the symmetric difference of any three blocks is either a block or the complement of a block. The designs associated to the symplectic difference sets introduced by Kantor (J Algebra 33:43–58, 1975) have the SDP. Parker (J Comb Theory Ser A 67:23–43, 1994) claimed that the symplectic design on 64 points is the only SDP design on 64 points admitting an abelian regular automorphism group (an abelian difference set). We show in this paper that there is an SDP design on 64 points that is not isomorphic to the symplectic design and yet admits the group $$C_8 \times C_4 \times C_2$$ as a regular automorphism group. This abelian difference set is the first in an infinite family of abelian difference sets whose designs have the SDP and yet are not isomorphic to the symplectic designs of the same order. We define a new method for establishing the non-isomorphism of the two families. |
| Databáze: | OpenAIRE |
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