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arXiv 2201.08632math.CO
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辛极空间的交叉$t$ -交族

Cross $t$-intersecting families for symplectic polar spaces

Tian Yao, Kaishun Wang

摘要:

设$\mathscr{P}$是有限域$\mathbb{F}_q$上的辛极空间,$\mathscr{P}_m$表示$\mathscr{P}$中所有$k$维全迷向子空间的集合.令$\mathscr{F}_1\subset\mathscr{P}_{m_1}$和$\mathscr{F}_2\subset\mathscr{P}_{m_2}$对于任何$F_1\in\mathscr{F}_1$和$F_2\in\mathscr{F}_2$满足$\dim(F_1\cap F_2)\ge t$。我们说他们是交叉PDMATHAMV-交叉家庭。此外,我们说它们是平凡的,如果它们的每个成员包含一个固定的$t$维全迷向子空间。本文证明了具有最大尺寸积的交叉$t$ -交族是平凡的.我们还描述了非平凡的$t$ -相交的家庭的最大产品的大小的结构。

英文摘要:

Let $\mathscr{P}$ be a symplectic polar space over a finite field $\mathbb{F}_q$, and $\mathscr{P}_m$ denote the collection of all $k$-dimensional totally isotropic subspace in $\mathscr{P}$. Let $\mathscr{F}_1\subset\mathscr{P}_{m_1}$ and $\mathscr{F}_2\subset\mathscr{P}_{m_2}$ satisfy $\dim(F_1\cap F_2)\ge t$ for any $F_1\in\mathscr{F}_1$ and $F_2\in\mathscr{F}_2$. We say they are cross $t$-intersecting families. Moreover, we say they are trivial if each member of them contains a fixed $t$-dimensional totally isotropic subspace. In this paper, we show that cross $t$-intersecting families with maximum product of sizes are trivial. We also describe the structure of non-trivial $t$-intersecting families with maximum product of sizes.

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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