Keywords. Space with walls, Median graph, CAT(0) cube complex
AMS subject classification. Primary: 20F65. Secondary: 20E42.
E-print: arXiv:math.GT/0309001
Submitted: 31 August 2003. Accepted: 21 March 2004. Published: 6 May 2004.
Bogdan Nica
Department of Mathematics, McGill University
Montreal, Canada H3A 2K6
Email: bnica@math.mcgill.ca
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