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Название: The red book of mathematical problems
Авторы: Williams K., Hardy K.
Аннотация:
Handy compilation of 100 practice problems, hints and solutions indispensable for students preparing for the William Lowell Putnam and other mathematical competitions. Problems suggested by a variety of sources: Crux Mathematicorum, Mathematics Magazine, the American Mathematical Monthly and others. Preface to the First Edition. Sources. 1988 edition.