Tag Archives: sum-free sets

Clive Sinclair

Yesterday I read the news that Clive Sinclair has died. This brought back memories of my first encounter with personal computers nearly 40 years ago. At the time I had a demanding job and three small children, and I was … Continue reading

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London Combinatorics Colloquia 2017

A brief trip to London for the two colloquia and a meeting of the committee, marred for me by the fact that I had come down with quite a bad cold (which, scarily, involved my losing my balance from time … Continue reading

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From the archive, 5

The first of my two papers with Paul Erdős was published in 1990 in a conference proceedings, and is a bit inaccessible; I have never managed to find a copy on the web. The Hungarians are collecting electronic copies of … Continue reading

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From the archive, 3

This is what I looked like in 1991: And here is evidence for the Cameron–Erdős conjecture before it was proved:

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London Combinatorics Colloquia, 2

It’s that time of year again, and while I miss the buttercups in Reading, we had as usual a feast of interesting mathematics and a large and enthusiastic audience. It was a bit more tightly focussed than I would have … Continue reading

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Homogeneous Cayley objects, 3

In this post, I will consider Henson’s graphs as Cayley graphs. Henson’s graphs Recall from the first post of the series the conditions for a class of finite relational structures to be a Fraïssé class, that is, the class of … Continue reading

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