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A new family of tight sets in Q(+)(5, q)

机译:Q(+)(5,q)中的紧集的新族

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In this paper, we describe a new infinite family of -tight sets in the hyperbolic quadrics , for . Under the Klein correspondence, these correspond to Cameron-Liebler line classes of having parameter . This is the second known infinite family of nontrivial Cameron-Liebler line classes, the first family having been described by Bruen and Drudge with parameter in for all odd . The study of Cameron-Liebler line classes is closely related to the study of symmetric tactical decompositions of (those having the same number of point classes as line classes). We show that our new examples occur as line classes in such a tactical decomposition when (so for some positive integer ), providing an infinite family of counterexamples to a conjecture made by Cameron and Liebler (in Linear Algebra Appl 46, 91-102, 1982); the nature of these decompositions allows us to also prove the existence of a set of type in the affine plane for all positive integers . This proves a conjecture made by Rodgers in his Ph.D. thesis.
机译:在本文中,我们针对的双曲二次曲面描述了一个新的无穷紧族集。在Klein对应下,这些对应于具有参数的Cameron-Liebler线类。这是非平凡的Cameron-Liebler线类的第二个已知无穷大族,第一个族由Bruen和Drudge用in参数表示为奇数。 Cameron-Liebler线类的研究与的对称战术分解研究(具有与线类相同数量的点类)密切相关。我们证明,当这样的战术分解(对于一些正整数)时,我们的新示例作为线类出现,从而为Cameron和Liebler的猜想提供了无穷的反例族(在​​Linear Algebra Appl 46,91-102,1982中)。 );这些分解的性质使得我们也可以证明仿射平面中所有正整数都存在一组类型。这证明了罗杰斯(Rodgers)在其博士学位论文中做出的一种推测。论文。

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