The Colossal Book Of Mathematics by Martin Gardner

A sprawling anthology of engaging essays and puzzles that collects decades of popular recreational mathematics writing, presenting clever problems, paradoxes, visual puzzles, number tricks, geometric curiosities, and accessible expositions of topics from topology, combinatorics, and number theory; it blends historical anecdotes with clear, playful explanations and solutions, designed to delight both curious lay readers and seasoned problem-solvers while showcasing the creative thinking and surprises that make mathematics fun.

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