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单词 Dense subset
释义

Dense subset

中文百科

稠密集 Dense set

(重定向自Dense subset)

在拓扑学及数学的其它相关领域,给定拓扑空间X及其子集A,如果对于X中任一点xx的任一邻域同A的交集不为空,则A称为在X稠密。直观上,如果X中的任一点x可以被A中的点很好的逼近,则称AX稠密

等价地说,AX稠密当且仅当X中唯一包含A的闭集是X自己。或者说,A的闭包是X,又或者A的补集的内部是空集。

英语百科

Dense set 稠密集

(重定向自Dense subset)

In topology and related areas of mathematics, a subset A of a topological space X is called dense (in X) if every point x in X either belongs to A or is a limit point of A. Informally, for every point in X, the point is either in A or arbitrarily "close" to a member of A for instance, every real number is either a rational number or has one arbitrarily close to it (see Diophantine approximation).

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更新时间:2025/6/17 22:55:32