arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.16352math.CO
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Cameron-Liebler线型

Cameron-Liebler line classes

Morgan Rodgers

摘要:

给出了$\mathrm{PG}(3,q)$中带有参数$\frac{1}{2}(q^2 -1)$的Cameron-Liebler线型的新例子。这些例子是用计算机搜索对$q$的许多奇数值构造的,通过从作用于空间的循环直射变换群形成线轨道的并集。虽然有许多等价的这些对象的特征,也许最重要的是,一组线$\mathcal{L}$在$\mathrm{PG}(3,q)$是一个卡梅隆-利布勒线类参数$x$当且仅当每个扩展$\mathcal{S}$的空间正好共享$x$线与$\mathcal{L}$。这些对象是有关的对称战术分解的$\mathrm{PG}(3,q)$,以及分组的$\mathrm{PΓL}(4,q)$具有同样多的轨道上的点和线的$\mathrm{PG}(3,q)$的推广。此外,在某些情况下,我们构造的线类与$\mathrm{AG}(2,q)$中的两个交集有关。由于有很少的已知的例子,这些集为$q$奇,在这个方向上的任何新的结果是特别感兴趣的。

英文摘要:

New examples of Cameron-Liebler line classes in $\mathrm{PG}(3,q)$ are given with parameter $\frac{1}{2}(q^2 -1)$. These examples have been constructed for many odd values of $q$ using a computer search, by forming a union of line orbits from a cyclic collineation group acting on the space. While there are many equivalent characterizations of these objects, perhaps the most significant is that a set of lines $\mathcal{L}$ in $\mathrm{PG}(3,q)$ is a Cameron-Liebler line class with parameter $x$ if and only if every spread $\mathcal{S}$ of the space shares precisely $x$ lines with $\mathcal{L}$. These objects are related to generalizations of symmetric tactical decompositions of $\mathrm{PG}(3,q)$, as well as to subgroups of $\mathrm{PΓL}(4,q)$ having equally many orbits on points and lines of $\mathrm{PG}(3,q)$. Furthermore, in some cases the line classes we construct are related to two-intersection sets in $\mathrm{AG}(2,q)$. Since there are very few known examples of these sets for $q$ odd, any new results in this direction are of particular interest.

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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