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arXiv 1706.03036math.MGmath.FAmath.NT
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仿射正多边形的一个刻划

A characterization of affinely regular polygons

Zsolt Langi

摘要:

1970年,Coxeter给出了一个简洁的几何证明,证明了如果$p_1, p_2, \ldots, p_n$是一个$n$ -边形$P$的循环序顶点,则$P$是仿射正则的当且仅当存在某个$λ\geq 0$使得$p_{j+2}-p_{j-1} = λ(p_{j+1}-p_j)$对于$j=1,2,\ldots, n$ .本文的目的是研究多边形的性质,其顶点$p_1,p_2,\ldots,p_n \in \mathbb{C}$满足$p_{j+m_1}-p_{j+m_2} = w (p_{j+k}-p_j)$的性质,对于某些$w \in \mathbb{C}$和$m_1,m_2,k \in \mathbb{Z}$。特别是,我们表明,在“大多数”情况下,这意味着多边形是affirmative定期,但在某些特殊情况下,有多边形满足此属性,但不affirmative定期。证明是基于使用线性代数和数论工具。此外,我们应用我们的方法来表征多面体与某些对称群。

英文摘要:

In 1970, Coxeter gave a short and elegant geometric proof showing that if $p_1, p_2, \ldots, p_n$ are vertices of an $n$-gon $P$ in cyclic order, then $P$ is affinely regular if, and only if there is some $λ\geq 0$ such that $p_{j+2}-p_{j-1} = λ(p_{j+1}-p_j)$ for $j=1,2,\ldots, n$. The aim of this paper is to examine the properties of polygons whose vertices $p_1,p_2,\ldots,p_n \in \mathbb{C}$ satisfy the property that $p_{j+m_1}-p_{j+m_2} = w (p_{j+k}-p_j)$ for some $w \in \mathbb{C}$ and $m_1,m_2,k \in \mathbb{Z}$. In particular, we show that in `most' cases this implies that the polygon is affinely regular, but in some special cases there are polygons which satisfy this property but are not affinely regular. The proofs are based on the use of linear algebraic and number theoretic tools. In addition, we apply our method to characterize polytopes with certain symmetry groups.

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。

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