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Nov 10, 2012 at 22:02 history edited John Pardon CC BY-SA 3.0
corrected spelling of "cannot"
Nov 12, 2011 at 15:18 vote accept Jesko Hüttenhain
Nov 12, 2011 at 5:11 comment added Torsten Ekedahl That's right, though you could also use crystalline cohomology which could be defined as the cohomology of a complex of sheaves in the Zariski topology.
Nov 12, 2011 at 1:20 comment added Jesko Hüttenhain Just to make sure I understand, this Euler characteristic would be defined via, e.g., étale or $\ell$-adic cohomology groups. However, we only have a Grothendieck topology on $X$ and not a canonical, classical topology whose singular homology groups yield the same number.
Nov 11, 2011 at 19:49 history edited Torsten Ekedahl CC BY-SA 3.0
added 364 characters in body
Nov 11, 2011 at 18:57 history answered Torsten Ekedahl CC BY-SA 3.0