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On the 430-cap of $$\textrm{PG}(6,4)$$ having two intersection sizes with respect to hyperplanes
Designs, Codes and Cryptography ( IF 1.6 ) Pub Date : 2023-11-18 , DOI: 10.1007/s10623-023-01318-1
John Bamberg

Let \({\mathcal {C}}\) be a 430-cap of \(\textrm{PG}(6,4)\) having two intersection sizes with respect to hyperplanes. We show that no hyperplane of \(\textrm{PG}(6,4)\) intersects \({\mathcal {C}}\) in a Hill 78-cap. So if it can be shown that the Hill 78-cap of \(\textrm{PG}(5,4)\) is projectively unique, then such a 430-cap does not exist, or equivalently, a two-weight \([430,7]_{\mathbb {F}_4}\) linear code with dual weight at least 4, does not exist.



中文翻译:

在 $$\textrm{PG}(6,4)$$ 的 430 上限上,相对于超平面有两个交集大小

\({\mathcal {C}}\)为\(\textrm{PG}(6,4)\)的 430 上限,具有两个相对于超平面的交集大小。我们证明,在 Hill 78 帽中,\(\textrm{PG}(6,4)\)没有超平面与\({\mathcal {C}}\)相交。因此,如果可以证明\(\textrm{PG}(5,4)\)的 Hill 78-cap是投影唯一的,那么这样的 430-cap 不存在,或者等效地,两个权重\( [430,7]_{\mathbb {F}_4}\) 对偶权重至少为 4 的线性代码不存在。

更新日期:2023-11-19
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