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Restricted product : ウィキペディア英語版
Restricted product
In mathematics, the restricted product is a construction in the theory of topological groups.
Let I be an indexing set; S a finite subset of I. If for each i\in I, G_i is a locally compact group, and for each i\in I\backslash S, K_i \subset G_i is an open compact subgroup, then the restricted product
: ' G_i\,
is the subset of the product of the G_i 's consisting of all elements (g_i)_ such that g_i \in K_i for all but finitely many i\in I\backslash S.
This group is given the topology whose basis of open sets are those of the form
: \prod_i A_i\,,
where A_i is open in G_i and A_i = K_i for all but finitely many i.
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)
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