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compactly generated group : ウィキペディア英語版
compactly generated group
In mathematics, a compactly generated (topological) group is a topological group ''G'' which is algebraically generated by one of its compact subsets.〔.〕 This should not be confused with the unrelated notion (widely used in algebraic topology) of a compactly generated space -- one whose topology is generated (in a suitable sense) by its compact subspaces.
== Definition ==

A topological group ''G'' is said to be compactly generated if there exists a compact subset ''K'' of ''G'' such that
:\langle K\rangle = \bigcup_)^n = G.
So if ''K'' is symmetric, i.e. ''K'' = ''K'' −1, then
:G = \bigcup_{n \in \mathbb{N}} K^n.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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