I tried to prove you could untie knots in a sphere in five dimensions. In the first of six programmes Christopher Zeeman , Professor of Mathematics at the Universitv of Warwick talks to Professor Lewis Wolpert of the Middlesex Hospital Medical School, London, about the satisfactions of a subject in which it may take a month to read a paper. and seven years to solve a problem with no apparent application to the real world.
Producer ALISON RICHARDS