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During the early 1970s Richard Mabey explored crumbling city docks and overgrown bomb-sites, navigated inner city canals and car parks, and discovered there was scarcely a nook in our urban landscape incapable of supporting life. The Unofficial Countryside is a timely reminder of how nature flourishes against the odds, surviving in the most obscure and surprising places.

This short reference book contains fundamental concepts crucial to solving math competition problems such as those found on the Mathematical Association of America's AMC 10, AMC 12, and AIME, as well as those found in local or regional competitions. Full of formulas as well as examples and solutions, this book shows how specific problems can be best solved in order to succeed in math competitions. Content is organized by mathematical topic and has been selected for its diversity. Topics include Number Theory, Combinatorics, Probability, Statistics, Sequences and Series, Algebra, Geometry,...