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Stanford Mathematics Problem Book

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Mathematical Discovery on Understanding, Learning, and Teaching Problem Solving, Volume II

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Problems and Theorems in Analysis II

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Mathematics and Plausible Reasoning, Volume 1

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Mathematical Discovery on Understanding, Learning, and Teaching Problem Solving, Volume I

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Mathematische Werke

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Schule des Denkens

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Problems and Theorems in Analysis I

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Resolución de problemas matemáticos aplicando teorías de George Polya

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Notes on Introductory Combinatorics

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Mathematical Discovery on Understanding, Learning and Teaching Problem Solving, Combined Volumes I and II