Mathematician:Giovanni Girolamo Saccheri

Mathematician
Italian Jesuit priest, scholastic philosopher, and mathematician.

Attempted (but failed) to prove Euclid's fifth postulate by means of Reductio ad Absurdum, and in the process narrowly missed discovering a non-Euclidean geometry.

Nationality
Italian

History

 * Born: 5 September 1667 in San Remo, Genoa (now Italy)
 * Died: 25 October 1733 in Milan (now Italy)

Theorems and Definitions

 * Khayyam-Saccheri Quadrilateral (with )
 * Saccheri-Legendre Theorem (with )

Publications

 * 1693: Quaesita Geometrica
 * 1697: Logica Demonstrativa
 * 1708: Neo-Statica
 * 1733: Euclides ab Omni Naevo Vindicatus ("Euclid Cleared from Every Stain")