Paul Guldin
Paul Guldin – 3 November 1643 ) was a Swiss Jesuit mathematician and astronomer. He discovered the Guldinus theorem to determine the surface and the volume of a solid of revolution. Guldin was noted for his association with the German mathematician and astronomer Johannes Kepler. Guldin composed a critique of Cavalieri's method of Indivisibles.
Although of Jewish descent, his parents were Protestants and they brought Guldin up in that faith. He was a professor of mathematics in Graz and Vienna.
In Paolo Casati's astronomical work Terra machinis mota, Casati imagines a dialogue among Guldin, Galileo, and Marin Mersenne on various intellectual problems of cosmology, geography, astronomy and geodesy.
