Hi category gurus and categorists I have many questions about category theory but i start with one. 1> What are smooth functors and proper functors, originating in pursuing stacks? Both nontechnically and technicaly. I know they are dual to each other and that they are characterized by cohomological properties inspired by the proper or smooth base change theorem in algebraic geometry, but what is the relation? (I don't know the statement of the theorems) Finally, what are smooth and proper functors good for? Are smooth and proper functors fibrations and cofibrations or Grothendieck fibrations and Grothendieck op-fibrations in some model categories or derivators? The only thing i could find about smooth and proper functors on internet is the last entrance in http://golem.ph.utexas.edu/category/2008/01/geometric_representation_theor_1... Best regards Rafael Borowiecki
Hi Rafael, I don't know much about this, but I listened to an excellent talk of Maltsiniotis a few months ago at IHES and posted the scanned notes in a blog post here: http://homotopical.wordpress.com/2009/01/26/maltsinotis-grothendieck-and-hom... These notes (on page 11-12) contain at least the definition of proper and smooth functors, and the duality statement, so maybe they can be of some limited use. Hopefully other people on this list can provide some more substantial information. Best regards, Andreas Holmstrom 2009/4/15 Hasse Riemann <rafaelb77@hotmail.com>:
Hi category gurus and categorists
I have many questions about category theory but i start with one.
1>
What are smooth functors and proper functors, originating in pursuing stacks?
Both nontechnically and technicaly.
I know they are dual to each other and that they are characterized by cohomological properties
inspired by the proper or smooth base change theorem in algebraic geometry, but what is the relation?
(I don't know the statement of the theorems)
Finally, what are smooth and proper functors good for?
Are smooth and proper functors fibrations and cofibrations or Grothendieck fibrations and
Grothendieck op-fibrations in some model categories or derivators?
The only thing i could find about smooth and proper functors on internet is the last entrance in http://golem.ph.utexas.edu/category/2008/01/geometric_representation_theor_1...
Best regards
Rafael Borowiecki
Hi, The following paper is very clear, I'm currently learning the basics of the subject with it: http://people.math.jussieu.fr/~maltsin/ps/ asphbl.ps. It's written in French. Another member of this mailing- list has asked me to translate it in English, I may be able to send you a rough translation in a few weeks. Best, Jonathan Le 15 avr. 09 à 15:45, Hasse Riemann a écrit :
Hi category gurus and categorists
I have many questions about category theory but i start with one.
1>
What are smooth functors and proper functors, originating in pursuing stacks?
Both nontechnically and technicaly.
I know they are dual to each other and that they are characterized by cohomological properties
inspired by the proper or smooth base change theorem in algebraic geometry, but what is the relation?
(I don't know the statement of the theorems)
Finally, what are smooth and proper functors good for?
Are smooth and proper functors fibrations and cofibrations or Grothendieck fibrations and
Grothendieck op-fibrations in some model categories or derivators?
The only thing i could find about smooth and proper functors on internet is the last entrance in http://golem.ph.utexas.edu/category/2008/01/ geometric_representation_theor_18.html
Best regards
Rafael Borowiecki
participants (3)
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Andreas Holmstrom -
Hasse Riemann -
Jonathan CHICHE 齐正航