Vol. 4, No. 1, 2010
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The Picard group of $\mathscr M_{1,1}$

William Fulton and Martin Olsson
Vol. 4 (2010), No. 1, 87–104
DOI: 10.2140/ant.2010.4.87
Abstract

We compute the Picard group of the moduli stack of elliptic curves and its canonical compactification over general base schemes.

Keywords
moduli spaces, stacks, Picard group
Mathematical Subject Classification 2000
Primary: 14D22
Secondary: 14D05
Milestones
Received: 15 May 2009
Revised: 30 September 2009
Accepted: 30 November 2009
Published: 14 January 2010
Authors
William Fulton
Department of Mathematics
University of Michigan
Ann Arbor, MI 48109-1043
United States
Martin Olsson
Department of Mathematics
Univesity of California
Berkeley, CA 94720-3840
United States