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.

 

	Archive
1st IMO 1959   tex 2nd IMO 1960   tex 3rd IMO 1961   tex 4th IMO 1962   tex 5th IMO 1963   tex 6th IMO 1964   tex 7th IMO 1965   tex 8th IMO 1966   tex 9th IMO 1967   tex 10th IMO 1968   tex 11th IMO 1969   tex 12th IMO 1970   tex 13th IMO 1971   tex 14th IMO 1972   tex 15th IMO 1973   tex 16th IMO 1974   tex 17th IMO 1975   tex 18th IMO 1976   tex 19th IMO 1977   tex 20th IMO 1978   tex 21st IMO 1979   tex	No IMO 1980! 22nd IMO 1981   tex 23rd IMO 1982   tex 24th IMO 1983   tex 25th IMO 1984   tex 26th IMO 1985   tex 27th IMO 1986   tex 28th IMO 1987   tex 29th IMO 1988   tex 30th IMO 1989   tex 31st IMO 1990   tex 32nd IMO 1991   tex 33rd IMO 1992   tex 34th IMO 1993   tex 35th IMO 1994   tex 36th IMO 1995   tex 37th IMO 1996   tex 38th IMO 1997   tex 39th IMO 1998   tex 40th IMO 1999   tex	41st IMO 2000   tex 42nd IMO 2001   tex 43rd IMO 2002   tex 44th IMO 2003   tex                             All IMOs in tex

 
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