The essence of TQFT
                  30/06/2004 Wednesday 30th June 2004, 16:00 (Amphitheatre Pa1, Mathematics Building) 
                  
                  
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                    Roger Picken, Instituto Superior Técnico
                    
                   
                  TQFT, the acronym for Topological Quantum Field Theory, is a construction which arose in physics, but has found applications in several areas of mathematics, in particular the theory of knots, braids and similar objects. The purpose of this talk is to explain some of the underlying notions, in such a way as to be accessible to people with a wide range of mathematical backgrounds. 
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