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arXiv 2403.03381math.CO
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具有二阶自同构的对称 2$-$(36,15,6) 设计

Symmetric 2$-$(36,15,6) designs with an automorphism of order two

Sanja Rukavina, Vladimir D. Tonchev

AI总结:

本文完成了所有容许二阶自同构的对称 2-(36,15,6) 设计的分类,共发现 1,547,701 个非同构设计,并计算了其关联矩阵张成的三元线性码,发现了具有未知重量分布的近极值自对偶码。

摘要:

参数 2-(36,15,6) 是目前尚未完成同构完全分类的最小对称设计参数。Bouyukliev、Fack 和 Winne 对所有容许奇素数阶自同构的 2-$(36,15,6)$ 设计进行了分类,并对容许 2 阶自同构的此类设计给出了部分分类。本文给出了所有容许二阶自同构的对称 2-$(36,15,6)$ 设计的分类。结果表明,恰好存在 $1 547 701$ 个非同构的此类设计,其中有 $135 779$ 个为自对偶设计。本文还计算了由这些设计的关联矩阵张成的三元线性码。在这些码中,发现了具有先前未知重量分布的近极值自对偶码。

英文摘要:

The parameters 2-(36,15,6) are the smallest parameters of symmetric designs for which a complete classification up to isomorphism is yet unknown. Bouyukliev, Fack and Winne classified all 2-$(36,15,6)$ designs that admit an automorphism of odd prime order, and gave a partial classification of such designs that admit an automorphism of order 2. In this paper, we give the classification of all symmetric 2-$(36,15,6)$ designs that admit an automorphism of order two. It is shown that there are exactly $1 547 701$ nonisomorphic such designs, $135 779$ of which are self-dual designs. The ternary linear codes spanned by the incidence matrices of these designs are computed. Among these codes, there are near-extremal self-dual codes with previously unknown weight distributions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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