arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.12429math.CO
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Cameron-Liebler $k$ -在$\text{AG}(n,q)$中设置

Cameron-Liebler $k$-sets in $\text{AG}(n,q)$

Jozefien D'haeseleer, Ferdinand Ihringer, Jonathan Mannaert, Leo Storme

摘要:

本文研究了仿射几何中的Cameron-LieblerPDMATHABMM-集,从而研究了$\text{AG}(n, q)$中的$k$ -空间集.推广了射影几何$\text{PG}(n, q)$中Cameron-Liebler $k$ -集的研究。注意,在代数组合学中,$\text{AG}(n, q)$的Cameron-Liebler $k$ -集对应于$\text{AG}(n, q)$中$k$ -空间的结合方案的某些公平二等分,而在布尔函数的分析中,它们对应于$\text{AG}(n, q)$的布尔度$1$函数。利用与$k$ -散布的交性质,在$\text{AG}(n, q)$中定义了Cameron-LieblerPDMATHABMM-集,并证明了几种定义的等价性.特别地,我们研究了$\text{AG}(n, q)$和$\text{PG}(n, q)$中Cameron-LieblerPDMATHABMM-集之间的关系.作为副产品,我们计算了仿射直线结合方案的特征表。此外,我们还刻画了Cameron-Liebler $k$ -集的最小例子。本文主要研究$n > 3$的$\text{AG}(n, q)$,而$\text{AG}(3, q)$中Cameron-Liebler线类的情况已经被单独处理。

英文摘要:

We study Cameron-Liebler $k$-sets in the affine geometry, so sets of $k$-spaces in $\text{AG}(n, q)$. This generalizes research on Cameron-Liebler $k$-sets in the projective geometry $\text{PG}(n, q)$. Note that in algebraic combinatorics, Cameron-Liebler $k$-sets of $\text{AG}(n, q)$ correspond to certain equitable bipartitions of the Association scheme of $k$-spaces in $\text{AG}(n, q)$, while in the analysis of Boolean functions, they correspond to Boolean degree $1$ functions of $\text{AG}(n, q)$. We define Cameron-Liebler $k$-sets in $\text{AG}(n, q)$ by intersection properties with $k$-spreads and show the equivalence of several definitions. In particular, we investigate the relationship between Cameron-Liebler $k$-sets in $\text{AG}(n, q)$ and $\text{PG}(n, q)$. As a by-product, we calculate the character table of the association scheme of affine lines. Furthermore, we characterize the smallest examples of Cameron-Liebler $k$-sets. This paper focuses on $\text{AG}(n, q)$ for $n > 3$, while the case for Cameron-Liebler line classes in $\text{AG}(3, q)$ was already treated separately.

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