One of the best things about being a mathematician is the opportunity to travel. I have kept various travel diaries . I play the guitar. Here is my latest picture of the density spectrum of random sum-free sets . See another photograph of me in the School photo gallery, and my Graph Theory White Pages entry .
More pictures are in the picture gallery .
Here are Neill's work and personal pages, and pages about my namesakes in Merseyside , Florida , Victoria , and New York . A graph is N-free if it does not contain the path of length 3 as an induced subgraph. Then the following identity holds. This somewhat resembles in form the denominator identity of a Kac-Moody Lie algebra. Old problems from my homepage are kept with annotations.