Vol. 4, No. 1, 2010

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An Euler–Poincaré bound for equicharacteristic étale sheaves

Carl A. Miller

Vol. 4 (2010), No. 1, 21–45

The Grothendieck–Ogg–Shafarevich formula expresses the Euler characteristic of an étale sheaf on a characteristic-p curve in terms of local data. The purpose of this paper is to prove an equicharacteristic version of this formula (a bound, rather than an equality). This follows work of R. Pink.

The basis for the proof of this result is the characteristic-p Riemann–Hilbert correspondence, which is a functorial relationship between two different types of sheaves on a characteristic-p scheme. In the paper we prove a one-dimensional version of this correspondence, considering both local and global settings.

characteristic-$p$ curves, Grothendieck–Ogg–Shafarevich formula, étale sheaves, Riemann–Hilbert correspondence, Frobenius endomorphism, minimal roots
Mathematical Subject Classification 2000
Primary: 14F20
Secondary: 13A35, 14F30
Received: 21 March 2009
Revised: 21 October 2009
Accepted: 23 November 2009
Published: 14 January 2010
Carl A. Miller
Department of Mathematics
530 Church Street
University of Michigan
Ann Arbor, MI 48109
United States