Keywords. Coarse geometry, amenable action, property A, warped cone
AMS subject classification. Primary: 53C20. Secondary: 43A07, 53C12, 20F69.
Submitted to GT on 17 March 2004. Paper accepted 27 December 2004. Paper published 6 January 2005. Corrected (proof of 1.10) 7 March 2005.
Department of Mathematics, Penn State University
University Park PA 16802, USA
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