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Paul Guldin (original name Habakkuk Guldin) (June 12, 1577 - November 3, 1643) was a mathematician and astronomer. He discovered the Guldinus theorem to determine the surface and the volume of a solid of rotation. This theorem was known in ancient times as Pappus's theorem.
He was born in St. Gallen, Switzerland and was a professor of mathematics in Graz and Vienna.
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