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单词 CardinalNumber
释义

cardinal number


A cardinal numberMathworldPlanetmath is an ordinal numberMathworldPlanetmath S with the property that SX for every ordinal number X which has the same cardinality as S. Cardinal numbers have the property that for every set A, there exists a unique cardinal number having the same number of elements as A.

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更新时间:2025/5/5 2:45:12