On two conjectures on the subspace inclusion 6 graph of a vector space

On two conjectures on the subspace inclusion 6 graph of a vector space
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关于向量空间子空间包含6图的两个猜想

DOI:
10.1142/s021949881850189x
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发表时间:
2017-09
影响因子:
0.8
通讯作者:
Chunguang Xia
Chunguang Xia
中科院分区:
数学3区
文献类型:
--
作者:
Dein Wong;Xinlei Wang;Chunguang Xia

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向量空间[Formula:see text]上的子空间包含图,记为[Formula:see text],是一个顶点集由[Formula:see text]的非平凡真子空间组成的图,如果一个顶点正确包含在另一个顶点中,则两个顶点相邻。在最近的一篇论文中,Das对子空间包含图[Formula:see text]提出了以下四个命题:如果[Formula:see text]是有限域[Formula:see text]上的[Formula:see text]维向量空间,其中[Formula:see text]元素,则:(1)[Formula:see text]的控制数是[Formula:see text]。(2)[公式:见正文]是距离正则。(3)[公式:见正文]是哈密尔顿的。(4)[公式:见文字]是一个凯莱图。本文证明了前两个定理:若[Formula:see text]是有限域[Formula:see text]上的含[Formula:see text]元素的[Formula:see text]维向量空间,则:(1)[Formula:see text]的控制数是[Formula:see text]。(2)[公式:见正文]是距离正则。
The subspace inclusion graph on a vector space [Formula: see text], denoted by [Formula: see text], is a graph whose vertex set consists of nontrivial proper subspaces of [Formula: see text] and two vertices are adjacent if one is properly contained in another. In a recent paper, Das posed the following four conjectures on the subspace inclusion graph [Formula: see text]: If [Formula: see text] is a [Formula: see text]-dimensional vector space over a finite field [Formula: see text] with [Formula: see text] elements, then: (1) The domination number of [Formula: see text] is [Formula: see text]. (2) [Formula: see text] is distance regular. (3) [Formula: see text] is Hamiltonian. (4) [Formula: see text] is a Cayley graph. In the present paper, we prove the first two conjectures: If [Formula: see text] is a [Formula: see text]-dimensional vector space over a finite field [Formula: see text] with [Formula: see text] elements, then: (1) The domination number of [Formula: see text] is [Formula: see text]. (2) [Formula: see text] is distance regular.
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期刊: Discret. Math.
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