Keywords. Group actions, Heisenberg group, almost simple
AMS subject classification. Primary: 57S25. Secondary: 37E30.
Submitted to GT on 28 March 2003. (Revised 26 October 2003.) Paper accepted 29 October 2003. Paper published 30 October 2003.
John Franks, Michael Handel
Department of Mathematics, Northwestern University
Evanston, IL 60208-2730, USA
Department of Mathematics, CUNY, Lehman College
Bronx, NY 10468, USA
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