Timeline for What are the uses of coefficient systems for arithmetic cohomology theories?
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
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| Oct 31, 2017 at 13:09 | vote | accept | user50948 | ||
| Oct 30, 2017 at 7:22 | comment | added | Will Sawin | @user50948 I don't know how nice and easy it is, but the reduction to the case of curves in this proof of the Grothendieck-Lefschetz fixed point formula should show you what I mean math.stanford.edu/~conrad/Weil2seminar/Notes/L20.pdf The reduction to curves requires $R f_!$, so if we only want the case of the constant sheaf, we still need the case of a general sheaf on curves. | |
| Oct 29, 2017 at 12:44 | comment | added | user50948 | great! Thanks! I was wondering if you have a nice and easy example of a statement in etale cohomology where I can explicitly see the Leray spectral sequence argument that you mention? Just something to get me started. Also, thanks for the link to Katz's paper, looks like a great starting point. | |
| Oct 28, 2017 at 19:35 | history | answered | Will Sawin | CC BY-SA 3.0 |