arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1207.7249math.GTmath.CO
收藏

具有$β_1=2$的紧邻流形的不存在性

Non-existence of tight neighborly manifolds with $β_1=2$

Nitin Singh

摘要:

对于$d\geq 2$,Walkup的类$\Kd$由$d$维单纯复形组成,其顶点链接是堆叠的$(d-1)$ -球体。最近Lutz,Sulanke和Swartz证明了所有$\mathbb{F}$ -可定向的三角化$d$ -流形满足不等式$\binom{f_0-d-1}{2} \geq \binom{d+2}{2}β_1$ for $d\geq 3$ .如果一个$d$ -流形在上界中达到相等,则称它为\emph{tight neighborly}.对于$d\geq 4$来说,紧邻$d$ -流形正是$\Kd$的2-邻成员。本文证明了不存在具有$β_1=2$的紧邻$d$ -流形.

英文摘要:

For $d\geq 2$, Walkup's class $\Kd$ consists of the $d$-dimensional simplicial complexes whose vertex-links are stacked $(d-1)$-spheres. Recently Lutz, Sulanke and Swartz have shown that all $\mathbb{F}$-orientable triangulated $d$-manifolds satisfy the inequality $\binom{f_0-d-1}{2} \geq \binom{d+2}{2}β_1$ for $d\geq 3$. They call a $d$-manifold \emph{tight neighborly} if it attains the equality in the bound. For $d\geq 4$, tight neighborly $d$-manifolds are precisely the 2-neighborly members of $\Kd$. In this paper we show that there does not exist any tight neighborly $d$-manifold with $β_1=2$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑