Euler's Gem: The Polyhedron Formula and the Birth of Topology: 82 (Princeton Science Library, 82)
Dr. Euler's Fabulous Formula: Cures Many Mathematical Ills: 52 (Princeton Science Library, 83)
An Imaginary Tale: The Story of √-1: 42 (Princeton Science Library)
Euler's Gem: The Polyhedron Formula and the Birth of Topology (Princeton Science Library)
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