科研之友
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摘要
Let S be a compact, 3-convex set in the plane, bounded by a simple closed curve, and let P be a finite subset of R-2\S. If every five points of P see a common point of S via R-2\S, then there exists at least one point so in S such that all points of P see so via R-2\S. The number five is best possible.
- 出版日期2012
