Paul Guldin, original name Habakkuk Guldin, born on June 12, 1577 in St. Gallen[?], Switzerland, died on November 3, 1643, mathematician and astronomer. 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 has been a professor of mathematics in Graz and Vienna.
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