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closed ball. In DICTIOUS you will not only get to know all the dictionary meanings for the word
closed ball, but we will also tell you about its etymology, its characteristics and you will know how to say
closed ball in singular and plural. Everything you need to know about the word
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English
Noun
closed ball (plural closed balls)
- (mathematical analysis) A ball which contains its boundary, i.e., a ball which is a closed set.
- In the set of 3-adic numbers, the closed ball of radius 1/3 "centered" at 1 is the set . 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.