Paul Guldin

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.