Crux Mathematicorum

The Crux Mathematicorum is an internationally respected source of unique and challenging mathematical problems published by the Canadian Mathematical Society. Designed primarily for the secondary and undergraduate levels, and also containing some pre-secondary material, it has been referred to as "the best problem solving journal in the world". All the problems and solutions are fully peer-reviewed for clarity, completeness and rigour by academic and professional mathematicians. Crux includes an "Olympiad Corner" which is particularly helpful for students preparing for math competitions.

The journal was established in 1975, under the name Eureka, by the Carleton-Ottawa Mathematics Association, with Léo Sauvé as its first editor-in-chief. It took the name Crux Mathematicorum with its fourth volume, in 1978, to avoid confusion with another journal Eureka published by the Cambridge University Mathematical Society. The Canadian Mathematical Society took over the journal in 1985, and soon afterwards G.W. (Bill) Sands became its new editor. Bruce L. R. Shawyer took over as editor in 1996. In 1997 it merged with another journal founded in 1988, Mathematical Mayhem, to become Crux Mathematicorum with Mathematical Mayhem. Jim Totten became editor in 2003, and Václav (Vazz) Linek replaced him in 2008.

Ross Honsberger writes that "for interesting elementary problems, this publication is in a class by itself". The journal is also known for reviving interest in Japanese temple geometry problems by publishing a series of them beginning in 1984. The International Mathematical Olympiad has made available problems involving inequalities from its first four volumes and calls the publication "the best problem solving journal all over the world".

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