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In mathematics, the restricted product is a construction in the theory of topological groups. Let be an indexing set; a finite subset of . If for each , is a locally compact group, and for each , is an open compact subgroup, then the restricted product : is the subset of the product of the 's consisting of all elements such that for all but finitely many . This group is given the topology whose basis of open sets are those of the form : where is open in and for all but finitely many . One can easily prove that the restricted product is itself a locally compact group. The best known example of this construction is that of the adele ring and idele group of a global field. ==See also== *Direct sum 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「restricted product」の詳細全文を読む スポンサード リンク
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