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constructible topology : ウィキペディア英語版
constructible topology
In commutative algebra, the constructible topology on the spectrum \operatorname(A) of a commutative ring A is a topology where each closed set is the image of \operatorname (B) in \operatorname(A) for some algebra ''B'' over ''A''. An important feature of this construction is that the map \operatorname(B) \to \operatorname(A) is a closed map with respect to the constructible topology.
With respect to this topology, \operatorname(A) is a compact,〔Some authors prefer the term ''quasicompact'' here.〕 Hausdorff, and totally disconnected topological space. In general the constructible topology is a finer topology than the Zariski topology, but the two topologies will coincide if and only if A / \operatorname(A) is a von Neumann regular ring, where \operatorname(A)\, is the nilradical of ''A''.
==See also==

*Constructible set (topology)

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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