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arXiv 1702.02185math.CT
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预层范畴上的保作用(弱)拓扑

Action preserving (weak) topologies on the category of presheaves

Zeinab Khanjanzadeh, Ali Madanshekaf

摘要:

设$\mathcal{C}$是一个完全小范畴.本文首先在预层范畴上构造了两个弱(Lawvere-Tierney)拓扑.其中一个由Yoneda函子的一个子函子建立,另一个由$\mathcal{C}$上的一个容许类和预层拓扑$\widehat{\mathcal{C}}$中的内部存在量词构造.此外,通过使用$\mathcal{C},$上的可接受类,我们能够定义$\widehat{\mathcal{C}}$的子对象分类器$Ω$上的动作。然后给出了$\widehat{\mathcal{C}}$上的两个弱拓扑和双重否定拓扑$\neg\neg$是保作用映射的必要条件。最后,除其他事项外,我们建立了一个行动保持弱拓扑$\widehat{\mathcal{C}}$。

英文摘要:

Let $\mathcal{C}$ be a finitely complete small category. In this paper, first we construct two weak (Lawvere-Tierney) topologies on the category of presheaves. One of them is established by means of a subfunctor of the Yoneda functor and the other one, is constructed by an admissible class on $\mathcal{C}$ and the internal existential quantifier in the presheaf topos $\widehat{\mathcal{C}}$. Moreover, by using an admissible class on $\mathcal{C},$ we are able to define an action on the subobject classifier $Ω$ of $\widehat{\mathcal{C}}$. Then we find some necessary conditions for that the two weak topologies and also the double negation topology $\neg\neg$ on $\widehat{\mathcal{C}}$ to be action preserving maps. Finally, among other things, we constitute an action preserving weak topology on $\widehat{\mathcal{C}}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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