some model categories

[Thierry Coquand]

 I tried in the following note to present as simply as possible 

the model structure discovered by

Christian Sattler on a large class of presheaf categories (the hypotheses

I have on the base category are not minimal). The goal of the note is only

to describe what are the fibrations, cofibrations and weak equivalence

without giving proofs (only the 2 first sections are necessary; one remark 

however is that the proofs are all effective).

 It is not clear at this point if the categories obtained by localising at weak 

equivalences are equivalent to the homotopy category of Top.

 Thierry

[Nicola Gambino]

Dear all,

Those of you who are interested in Christian Sattler's result may find of interest also the slides of two talks, available at: 

    http://www1.maths.leeds.ac.uk/~pmtng/gdr-I.pdf

    http://www1.maths.leeds.ac.uk/~pmtng/gdr-II.pdf

With best wishes,

Nicola

==
Dr Nicola Gambino

School of Mathematics, University of Leeds

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