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Person

Raphael Robinson

A man with short, light-colored hair and glasses is wearing a dark blazer over a striped shirt and a textured sweater.

American mathematician (1911–1995), a long-serving member of the Berkeley faculty and husband of the logician Julia Robinson. Among many contributions to logic and number theory, his 1947 paper "On the decomposition of spheres" tightened the Banach-Tarski theorem, proving that five pieces are necessary as well as sufficient for the doubling of a solid ball, and that four will not do.

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