出典:Wiktionary
出典:『Wiktionary』 (2012/04/01 13:10 UTC 版)
closed ball (複数形 closed balls)
. This closed ball partitions into exactly three smaller closed balls of radius 1/9, e.g.,
. Then each of those balls partitions into exactly 3 smaller closed balls of radius 1/27, and the sub-partitioning can be continued indefinitely, in a fractal manner.