Thru 2003 there were 44 IMOs, each with 6 problems, except for 1960 and 1962 which each had 7, giving a total 266 problems in all.

The IMO got noticeably harder in the late 1980s. There are two separate papers of 3 problems each. The idea is that in each paper the problems are in order of increasing difficulty. That is not always true. But in the last 10 years the last problem in the second paper has usually been hard.

Many thanks to all those who supplied solutions where I failed, or pointed out errors, or supplied better solutions. There are still some solutions which are clumsy or inelegant, and maybe even some which are wrong (although I am not aware of any). All suggestions for improvement would be most welcome. [email: jscholes@kalva.demon.co.uk]

There are some technical notes on formats etc below.

Technical notes. HTML4 is now implemented in most browsers. It provides for a much wider collection of math symbols. Previously I implemented many of these using the Truetype Font symbol, but this did not work well for those with non-Windows machines. I am now switching to the HTML4 symbols.

Changing the archive material will take time. Whenever I update a page, I also remove the "paper" speckled background, which has now begun to aggravate me!

I am also switching from providing .pdf files to providing .tex files, which are smaller.

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John Scholes

jscholes@kalva.demon.co.uk

14 Jul 2003

Last corrected/updated 4 Nov 03