While I was uploading lecture notes, I also put on the page the notes from my G. C. Steward lectures at Gonville and Caius College in 2008. You can find them here.
I spent the first half of 2008 in Cambridge, directing a programme on “Combinatorics and Statistical Mechanics” at the Isaac Newton Institute. Jan Saxl very kindly invited me to Caius, and arranged for me to be the G. C. Steward visiting fellow. Along with very congenial company at the excellent meals, and somewhat noisy accommodation above the infamous Gardenia restaurant in Rose Crescent, my only duties were to give “three or four” lectures to the mathematics students at the college, which I was very happy to do. I was able to play with various literary allusions: the title of the series was “Never apologise, always explain: scenes from mathematical life” – the first four words I regard as a good rule for a mathematician – and the individual lectures were “Before and beyond Sudoku”, “Proving theorems in Tehran”, “Transgressing the boundaries”, and “Cameron felt like counting”.