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arXiv 1608.02439math.CO
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特征$\ne 0$的平移广义四边形是线性的

A translation generalized quadrangle in characteristic $\ne 0$ is linear

Koen Thas

摘要:

从20世纪70年代开始,一个长期存在的猜想是,每个平移广义四边形都是线性的,也就是说,有一个自同态环是一个除环(或者,在几何术语中,有一个射影表示)。证明了任意平移广义四边形$Γ$理想地嵌入一个线性平移四边形中。这使我们能够在射影空间中弱表示任何这样的$Γ$,而且,对这些对象有一个定义良好的“特征”概念。然后,我们证明了每个平移四边形的正特性确实是线性的。

英文摘要:

It is a long-standing conjecture from the 1970s that every translation generalized quadrangle is linear, that is, has an endomorphism ring which is a division ring (or, in geometric terms, that has a projective representation). We show that any translation generalized quadrangle $Γ$ is ideally embedded in a translation quadrangle which is linear. This allows us to weakly represent any such $Γ$ in projective space, and moreover, to have a well-defined notion of "characteristic" for these objects. We then show that each translation quadrangle in positive characteristic indeed is linear.

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