英语词汇“sigma ring”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-现代词典

单词	sigma ring
释义	sigma ring sigma ring [′sig·mə ‚riŋ] (mathematics) A ring of sets where any countable union of its members is also a member.
随便看	samu samual morse samual oram samual pepys samuari samuel samuel abraham goudsmit samuel adams samuel adams (american revolutionary) samuel adler samuel adrian baugh samuel agnon samuel a levine samuel alexander samuel alexander kinnier wilson samuel ames samuel bailey samuel barber samuel barclay beckett samuel becket samuel beckett samuel blatchford samuel bradbury samuel brainsample samuel butler

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