High Quality Content by WIKIPEDIA articles! Paolo Casati (in Latin, Paulus Casatus) (1617 – 22 December 1707) was an Italian Jesuit mathematician. Born in Piacenza to a Milanese family, he joined the Jesuits in 1634. After completing his mathematical and theological studies, he moved to Rome, where he assumed the position of professor at the Collegio Romano. He was given the chair in mathematics after teaching philosophy and theology.