Keywords. CAT(0), periodic flat planes, C(4)-T(4) complexes
AMS subject classification. Primary: 20F67. Secondary: 20F06.
Submitted: 27 January 2003. Accepted: 11 February 2003. Published: 20 February 2003.
Daniel T. Wise
Department of Mathematics and Statistics, McGill University
Montreal, Quebec H3A 2K6, Canada
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