Christopher Clapham was until 1993 Senior Lecturer in Mathematics at the University of Aberdeen and has also taught at universities in Nigeria, Lesotho, and Malawi. He is the author of Introduction to Abstract Algebra and Introduction to Mathematical Analysis. He lives in Exeter. James Nicholson has taught at Harrow School and was Head of Mathematics at Belfast Royal Academy. He is involved with many mathematical and statistical professional associations and has a particular interest in education. He has had seven articles published, and currently holds a bursary from the Teaching Statistic...