Roger B. Nelsen's Proofs Without Words: Exercises in Visual Thinking (1993) is a collection of mathematical proofs illustrated using diagrams. The book features proofs from various sources and historical periods, showcasing the power of visual reasoning in mathematics. Many proofs concern geometric theorems, but also include algebraic identities, and other mathematical concepts. The book's introduction discusses the history and nature of visual proofs. The author acknowledges numerous contributors and notes alterations made for uniformity.

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