A finite set of unit circular disks is given in a plane, such that the area of their union is S. Prove that there exists a subset of mutually disjoint disks whose union has area > 2S/9.
国际数学奥林匹克题 - Circular Disks
于德利 (2008-06-29 11:25:39) 评论 (0)A finite set of unit circular disks is given in a plane, such that the area of their union is S. Prove that there exists a subset of mutually disjoint disks whose union has area > 2S/9.