英语词汇“first category”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	first category
释义	first category first category [′fərst ′kad·ə‚gȯr·ē] (mathematics) A set is of first category if it is a countable union of nowhere dense sets. A set S is of first category at a point x if there is a neighborhood of x whose intersection with S is of first category.
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