CEVA, TOMASSO (1648-1736), Italian mathematician, was born at Milan on Dec. 20, 1648. He taught mathematics at the Jesuit college in Milan, and was a member of the order. While at the Brera college he co-operated with Saccheri in a number of mathematical researches. In 1678 Ceva published some work containing the theorem which is now known by his name and which deals with the concurrency of straight lines through the vertices of a triangle. FIe died at Milan on Feb. 3, 1736.