论文标题
圆弧是唯一具有外部功率点的分析性约旦曲线
Circular arcs are the only analytic Jordan curves with an exterior power point
论文作者
论文摘要
1946年，罗森鲍姆（J. Rosenbaum）提出了一个问题家族，询问需要多少功率点，以确保给定凸形体的边界$ c $是磁盘。在本文中，我们使用Riordan矩阵来表明，如果此曲线$ C $是分析性的，那么一个外部功率点就足够了。
In 1946, J. Rosenbaum proposed a family of problems asking how many power points are needed to ensure that the boundary $c$ of a given convex body is a disk. In this paper, we use Riordan matrices to show that, if this curve $c$ is analytic, then one single exterior power point is sufficient.
