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The Weil-étale topology on schemes over finite fields

Published online by Cambridge University Press:  21 April 2005

S. Lichtenbaum
Mathematics Department, Brown University, 151 Thayer Street, Providence, RI 02912,
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We introduce an essentially new Grothendieck topology, the Weil-étale topology, on schemes over finite fields. The cohomology groups associated with this topology should behave better than the standard étale cohomology groups. In particular there is a very natural definition of an Euler characteristic and a plausible conjecture relating the Euler characteristic of Z to the value of the zeta-function at s = 0. This conjecture is proved in certain cases.

Research Article
Foundation Compositio Mathematica 2005