### Top Posts

### Recent comments

- Peter Cameron on Service interrupted
- Kannappan Sampath on Service interrupted
- Robin Chapman on Tools for mathematicians
- Peter Cameron on Tools for mathematicians
- Robin Chapman on Tools for mathematicians

### Blogroll

- Annoying precision
- Astronomy Picture of the Day
- Azimuth
- Bad science
- Bob Walters
- Computational semigroup theory
- DC's Improbable Science
- Diamond Geezer
- Exploring East London
- Gödel's lost letter and P=NP
- Gil Kalai
- Haris Aziz
- Intersections
- Jane's London
- Jon Awbrey
- LMS blogs page
- Log24
- London Algebra Colloquium
- London Reconnections
- Machines like us
- Marie Cameron's blog
- MathBlogging
- Micromath
- Neill Cameron
- neverendingbooks
- Noncommutative geometry
- numericana hall of fame
- Paul Goldberg
- Robert A. Wilson's blog
- Sheila's blog
- Since it is not …
- Stubborn mule
- SymOmega
- Terry Tao
- The De Morgan Journal
- The London column
- The Lumber Room
- The matroid union
- Theorem of the day
- Tim Gowers
- XKCD

### Find me on the web

### Cameron Counts: RSS feeds

### Meta

# Author Archives: Peter Cameron

## Steiner systems exist, 2

One of the inevitable consequences of getting old is that my brain becomes more and more like a Swiss cheese, and important pieces of information fall through the holes. So I owe an apology to Michael Braun, Tuvi Etzion, Patric … Continue reading

## A sun dog

I’ve been fascinated by sky phenomena for some time; when out walking, I always keep an eye on the sky. Some years ago, on a train on the West Coast Main Line in the Lake District, I was treated to … Continue reading

## Tools for mathematicians

Over the weekend, in connection with a research project on semigroups (which I will write about shortly), I needed to know the distribution of the size of the image of a random mapping from the set {1,…,n} to itself. I … Continue reading

## A small calculation

Yesterday, a competitor in the London marathon collapsed and died. The event warranted a headline on the BBC news. The article pointed out that someone collapsed and died two years ago. Now, of course, running a marathon puts a huge … Continue reading

## Real v recreational mathematics

A footnote to my report on Persi Diaconis’ lecture on Martin Gardner. Persi challenged us to consider the question: Is there a sharp division between “real” mathematics and “recreational” mathematics, and if so, where does it come? G. H. Hardy clearly thought … Continue reading

Posted in exposition
Tagged Bill Kantor, G. H. Hardy, perfect shuffles, permutation groups, Persi Diaconis, Ron Graham
Leave a comment

## 66th British Mathematical Colloquium

By the time you read this, the BMC at Queen Mary will be over, or almost over. Due to circumstances more-or-less outside my control, I was only able to attend the first half-day. I heard the plenary lecture by Cédric … Continue reading

## Generation, t-designs and other mathematical notation

Donald Knuth, a mathematician (his adviser was Marshall Hall, his thesis on algebraic structures related to projective planes) turned computer scientist, became dissatisfied with typesetting while producing his multi-volume The Art of Computer Programming. So he took time off to … Continue reading

Posted in exposition, typography
Tagged angle brackets, LaTeX, t-designs, TeX, two-graphs
Leave a comment

## More on open access

The European Mathematical Society Newsletter has often discussed new developments in academic publishing, in particular open access. In the current issue, it returns to the fray with four somewhat contrasting opinions from a two semi-retired academics, two editors of Zentralblatt … Continue reading

## From the archive, 8

Various diaries came to light while I was office-clearing last Christmas, most notably a diary I kept for five months, from December 1986 to May 1987. I had just started work at Queen Mary College (as it was then), and … Continue reading