Proper Maps of Toposes is popular PDF and ePub book, written by Ieke Moerdijk in 2000, it is a fantastic choice for those who relish reading online the Mathematics genre. Let's immerse ourselves in this engaging Mathematics book by exploring the summary and details provided below. Remember, Proper Maps of Toposes can be Read Online from any device for your convenience.
Proper Maps of Toposes Book PDF Summary
We develop the theory of compactness of maps between toposes, together with associated notions of separatedness. This theory is built around two versions of "propriety" for topos maps, introduced here in a parallel fashion. The first, giving what we simply call "proper" maps, is a relatively weak condition due to Johnstone. The second kind of proper maps, here called "tidy", satisfy a stronger condition due to Tierney and Lindgren. Various forms of the Beck-Chevalley condition for (lax) fibered product squares of toposes play a central role in the development of the theory. Applications include a version of the Reeb stability theorem for toposes, a characterization of hyperconnected Hausdorff toposes as classifying toposes of compact groups, and of strongly Hausdorff coherent toposes as classifiying toposes of profinite groupoids. Our results also enable us to develop further particular aspects of the factorization theory of geometric morphisms studied by Johnstone. Our final application is a (so-called lax) descent theorem for tidy maps between toposes. This theorem implies the lax descent theorem for coherent toposes, conjectured by Makkai and proved earlier by Zawadowski.
Detail Book of Proper Maps of Toposes PDF
- Author : Ieke Moerdijk
- Release : 20 September 2024
- Publisher : American Mathematical Soc.
- ISBN : 9780821821688
- Genre : Mathematics
- Total Page : 125 pages
- Language : English
- PDF File Size : 12,9 Mb
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