“open ball”的概念、定义、翻译、参考文献-科学参考

单词	open ball
释义	open ball [`ō·pǝn `bȯl] ^MATHEMATICS In a metric space, an open set about a point x which consists of all points within a fixed distance from x.
随便看	pelotherapy pelouse pelphyte pelsparite peltate Peltier coefficient Peltier effect Pelton turbine Pelton wheel pelvic cavity pelvic fin pelvic girdle pelvic index pelvis pelviscope Pelycosauria pelyte pemphigoid pemphigus pemphigus contageosus pen Penaeidea penalty function pencatite pencil

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