Additional
Information: The sites in this category are related to competitions and mathematical olympiads, but must also contain content of interest to those not involved in the competition.
Valentin Vornicu's MathLinks Valentin Vornicu's MathLinks: Math Olympiad Problem Solving site with a weekly contest, resembling IMO in difficulty, with a large math forum and downloadable materials. (Competitions) http://www.mathlinks.ro
UK Mathematics Trust UK Mathematics Trust: Organizes national mathematics competitions in the UK for 12-18 year old students. (Competitions) http://www.mathcomp.leeds.ac.uk/
Mathematics Archives Mathematics Archives: links to contests, problem sets, journals sites. (Competitions) http://archives.math.utk.edu/contests
Crux Mathematicorum with Mathematical Mayhem Crux Mathematicorum with Mathematical Mayhem: Problem-solving journal at the senior secondary and university undergraduate levels. (Competitions) http://journals.cms.math.ca/CRUX/
Math Competitions in USA Math Competitions in USA: Sample problems, information and links from multiple contests. (Competitions) http://www.albanyconsort.com/contests/contests.html
Math Competition on the Web Math Competition on the Web: Links to national and international competitions as well as training pages for Putnam. (Competitions) http://donut.math.toronto.edu/~naoki/math-comp.htm
Australian Mathematics Trust Australian Mathematics Trust: Sponsors a number of competitions in the Australian continent. (Competitions) http://www.amt.canberra.edu.au/
The William Lowell Putnam Competition The William Lowell Putnam Competition: MAA page listing the winning teams and Putnam Fellows. (Competitions) http://www.maa.org/awards/putnam.html
Putnam Exam Information Putnam Exam Information: Results from the Putnam competition, old exams, and problem archives. Includes problem of the day, selected from over 540 different Putnam, National or International Olympiad problems. (Competitions) http://www.math.harvard.edu/putnam/
American Mathematics Competitions American Mathematics Competitions: Organization that administers the AMC, the AIME, and the USAMO, with information about the contests, math problem archives, recommended reading lists, and other resources for students interested in mathematics. (Competitions) http://www.unl.edu/amc/
Additional
Information: The sites in this category are related to competitions and mathematical olympiads, but must also contain content of interest to those not involved in the competition.
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