Author Archives: Peter Cameron

About Peter Cameron

I count all the things that need to be counted.

Donald Preece memorial day

Donald Preece Memorial Day On Thursday, 17 September, in the Fogg Lecture Theatre at Queen Mary University of London, there will be a memorial day for Donald Preece, statistician, combinatorialist, and organist. Put the date in your diary, and bookmark … Continue reading

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Eclipse non-event

Today there was a solar eclipse, they say. We were told that the sun would be 85% covered in London at 9.30am. But the clouds were so thick that nothing was visible, not even a dimming of the light. So … Continue reading

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Folding de Bruijn graphs

I wrote recently about foldings of de Bruijn graphs, why we are interested in them, and how pleased I was that we had agreed that the de Bruijn graph with word length 4 over a 2-letter alphabet has 1247 foldings … Continue reading

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Farewell Terry Pratchett

There is no point in trying to add to what others have said so well. Go look at XKCD, http://xkcd.com/1498/ or London Reconnections, http://www.londonreconnections.com/2015/ankh-morpock-transport-committee-march-2015/

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Representing the Fano matroid

In my lecture today I proved that the Fano matroid is representable over a field F if and only the characteristic of F is 2. There is a proof of this using only the classical theorems of Ceva and Menelaus … Continue reading

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Lost worlds

I am in St Andrews, and most of my books are in London, so I tend to pick up books I have read before. One of my all-time favourites is Michael Bywater’s Lost Worlds, subtitled What have we lost, and … Continue reading

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British Combinatorial Committee

Announcing a new website for the British Combinatorial Committee: https://britishcombinatorial.wordpress.com/. The British Combinatorial Committee is a charity, registered in Scotland, whose objective is the support of combinatorial and discrete mathematics in the United Kingdom. I have the honour of being … Continue reading

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