# Mathematician:Giovanni Girolamo Saccheri

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## 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 Omar Khayyam)
- Saccheri-Legendre Theorem (with Adrien-Marie Legendre)

Results named for **Giovanni Girolamo Saccheri** can be found here.

Definitions of concepts named for **Giovanni Girolamo Saccheri** can be found here.

## Publications

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

## Sources

- John J. O'Connor and Edmund F. Robertson: "Giovanni Girolamo Saccheri": MacTutor History of Mathematics archive

- 1998: David Nelson:
*The Penguin Dictionary of Mathematics*(2nd ed.) ... (previous) ... (next): Entry:**Saccheri, Girolamo**(1667-1733) - 2008: David Nelson:
*The Penguin Dictionary of Mathematics*(4th ed.) ... (previous) ... (next): Entry:**Saccheri, Girolamo**(1667-1733)