Paul Guldin (original name Habakkuk Guldin; 12 June 1577 (Mels) – 3 November 1643 (Graz)) was a Swiss Jesuit mathematician and astronomer. He discovered the Guldinus theorem to determine the surface and the volume of a solid of revolution. (This theorem is also known as the Pappus–Guldinus theorem and Pappus's centroid theorem, attributed to Pappus of Alexandria.) Guldin was noted for his association with the German mathematician and astronomer Johannes Kepler.^{[1]} Guldin composed a critique of Cavalieri's method of Indivisibles.^{[2]}
He was born in Mels, Switzerland, and was a professor of mathematics in Graz and Vienna.
In Paolo Casati's astronomical work Terra machinis mota (1658), Casati imagines a dialogue among Guldin, Galileo, and Marin Mersenne on various intellectual problems of cosmology, geography, astronomy and geodesy.
Paul Guldin  

Paul Guldin


Born  12 June 1577 
Died  3 November 1643 (aged 66) 
Nationality  Swiss 
Other names  Habakkuk Guldin 
Occupation  Jesuit mathematician astronomer 
Known for  Guldinus theorem 
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