嵌入对极平面与$p^2$阶射影平面中点、线对偶码的最小权
Embedded antipodal planes and the minimum weight of the dual code of points and lines in projective planes of order $p^2$
摘要：
由投影平面中点与线的关联矩阵生成的代码的最小权重已经知道了50多年。令人惊讶的是，寻找非素数阶射影平面的对偶码的最小权仍然是一个开放的问题，即使在Desklesian的情况下。在本文中，我们专注于$p^2$阶的射影平面的情况下，其中$p$是素数，我们链接的存在性，在对偶码的嵌入子平面和{ \em对映平面}的小重量码字。在德塞苔丝的情况下，我们可以排除这样的代码字显示一个更一般的结果，没有反足平面的顺序至少3可以嵌入在德塞苔丝投影平面。此外，我们使用组合参数，以排除存在的代码字的对偶代码的点和线的任意射影平面的顺序$p^2$，$p$素数，重量最多$2p^2-2p+4$使用两个以上的符号。特别地，这导致了这样的结果，即Desklesian投影平面$\mathrm{PG}(2,p^2)$的对偶码$p\geq 5$具有至少$2p^2-2p+5$的最小权重。
英文摘要：
The minimum weight of the code generated by the incidence matrix of points versus lines in a projective plane has been known for over 50 years. Surprisingly, finding the minimum weight of the dual code of projective planes of non-prime order is still an open problem, even in the Desarguesian case. In this paper, we focus on the case of projective planes of order $p^2$, where $p$ is prime, and we link the existence of small weight code words in the dual code to the existence of embedded subplanes and {\em antipodal planes}. In the Desarguesian case, we can exclude such code words by showing a more general result that no antipodal plane of order at least 3 can be embedded in a Desarguesian projective plane. Furthermore, we use combinatorial arguments to rule out the existence of code words in the dual code of points and lines of an arbitrary projective plane of order $p^2$, $p$ prime, of weight at most $2p^2-2p+4$ using more than two symbols. In particular, this leads to the result that the dual code of the Desarguesian projective plane $\mathrm{PG}(2,p^2)$, $p\geq 5$, has minimum weight at least $2p^2-2p+5$.
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