Pop-Up Geometry: The Mathematics Behind Pop-Up Cards

Joseph O'Rourke (Smith College, Massachusetts)

Pop-Up Geometry: The Mathematics Behind Pop-Up Cards
Format
Paperback
Publisher
Cambridge University Press
Country
United Kingdom
Published
24 March 2022
Pages
175
ISBN
9781009096263

Pop-Up Geometry: The Mathematics Behind Pop-Up Cards

Joseph O'Rourke (Smith College, Massachusetts)

Anyone browsing at the stationery store will see an incredible array of pop-up cards available for any occasion. The workings of pop-up cards and pop-up books can be remarkably intricate. Behind such designs lies beautiful geometry involving the intersection of circles, cones, and spheres, the movements of linkages, and other constructions. The geometry can be modelled by algebraic equations, whose solutions explain the dynamics. For example, several pop-up motions rely on the intersection of three spheres, a computation made every second for GPS location. Connecting the motions of the card structures with the algebra and geometry reveals abstract mathematics performing tangible calculations. Beginning with the nephroid in the 19th-century, the mathematics of pop-up design is now at the frontiers of rigid origami and algorithmic computational complexity. All topics are accessible to those familiar with high-school mathematics; no calculus required. Explanations are supplemented by 140+ figures and 20 animations.

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