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arXiv 1310.0705math.CTmath-phmath.MP
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几何数学在Grothendieck拓扑中的应用

Gelfand spectra in Grothendieck toposes using geometric mathematics

Bas Spitters, Steven Vickers, Sander Wolters

摘要:

在Heunen、Landsman和Spitters的量子理论的(协变)拓扑方法中,人们将每一个有单位的C*-代数A,一个在一个locale上的层拓扑T(A)和一个在该拓扑内的交换C*-代数a联系起来。a的Gelfand谱是这个topos中的locale S,它等价于基locale上的丛。我们进一步发展这种外部介绍的场所S,注意到,建设的Gelfand频谱在一个一般的拓扑可以描述使用几何逻辑。因此,频谱,作为一个捆绑,计算光纤。作为副产品的几何Gelfand谱,我们发现一个明确的外部描述的频谱时,拓扑是一个函子类别。作为一个中间结果,我们表明,局部完美的地图组成,使外部化的局部紧区域的拓扑层在局部紧区域是局部紧的。

英文摘要:

In the (covariant) topos approach to quantum theory by Heunen, Landsman and Spitters, one associates to each unital C*-algebra, A, a topos T(A) of sheaves on a locale and a commutative C*-algebra, a, within that topos. The Gelfand spectrum of a is a locale S in this topos, which is equivalent to a bundle over the base locale. We further develop this external presentation of the locale S, by noting that the construction of the Gelfand spectrum in a general topos can be described using geometric logic. As a consequence, the spectrum, seen as a bundle, is computed fibrewise. As a by-product of the geometricity of Gelfand spectra, we find an explicit external description of the spectrum whenever the topos is a functor category. As an intermediate result we show that locally perfect maps compose, so that the externalization of a locally compact locale in a topos of sheaves over a locally compact locale is locally compact, too.

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