Subject: contractability of the `thick' simplex. Date: Fri, 09 Jul 2004 10:36:40 +0100 From: Ronnie Brown To: Don Davis Does anyone know a nice direct proof that the thick geometric realisation (|| \Delta^n||) of the n-simplex is contractible? This would be useful for current writings! Ronnie Brown -- Professor Emeritus R. Brown, Department of Mathematics, University of Wales, Bangor Dean St., Bangor, Gwynedd LL57 1UT, United Kingdom Tel. direct:+44 1248 382474|office: 382681 fax: +44 1248 361429 World Wide Web: home page: http://www.bangor.ac.uk/~mas010/ (Links to survey articles: Higher dimensional group theory Groupoids and crossed objects in algebraic topology) Centre for the Popularisation of Mathematics: http://www.cpm.informatics.bangor.ac.uk/ (reorganised site with new sculpture animations)