All kinds of mathematics remind me of you 

Lisbon, 2427 July 2017 
SEE YOU THERE!! 
Conference poster 
Welcome to my St Andrews homepage. This page is under construction (and probably always will be!)
I am a halftime Professor in the School of Mathematics and Statistics at the University of St Andrews, and an Emeritus Professor of Mathematics at Queen Mary, University of London.
About me
On this site

Elsewhere

School of Mathematics and Statistics
University of St Andrews North Haugh St Andrews, Fife KY16 9SS SCOTLAND 
Tel.: +44 (0)1334 463769 Fax: +44 (0)1334 46 3748 Email: pjc20(at)starthurs(dot)ac(dot)uk [oops – wrong saint!] 
Page revised 19 April 2017 
A set S of natural numbers is sumfree if it contains no solution {x,y,z} to x+y = z.
We can choose a random sumfree set as follows: Consider the natural numbers in turn. When considering n, if n is the sum of two members of S, then n is not in S; otherwise decide whether to put n in S by tossing a fair coin.
A little is known, but much is not. Let S be a random sumfree set.
Old problems are kept here.