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219 (number) : ウィキペディア英語版 | 219 (number)
219 is the natural number following 218 and preceding 220. ==Mathematics==
*Mertens function(219) = 4, a record high. *There are 219 partially ordered sets on four labeled elements. *219 is the smallest number that can be represented as a sum of four positive cubes in two different ways.〔.〕 *There are 219 different space groups, discrete and full-dimensional sets of symmetries of three-dimensional space or of crystal structures.
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