1. Augustin-Louis Cauchy
The inventor of Infinitesimals and the Theory of Substitution Groups.
his most important contribution to mathematics was complex analysis.

2. Basic Facts Born: August 21st, 1789 Birthplace: Paris, France
Died: May 23rd, 1857 (68 yrs.)
Location of death: Sceaux, France
Cause of death: Illness
Nationality: French
Religion: Roman Catholic

3. Education He went to college and became an engineer.
University: École Centrale du Panthéon
University: École Polytechnique, Paris (1805-)
University: École Nationale des Ponts et Chaussées (1807-)
Gave up engineering to study mathematics.
Algebra
Analysis
Number Theory
Topology
Astronomy
First mathematician to try and make math rigorous.

4. Teachings
 Professor : 
Collège de France, Paris
 École Polytechnique, Paris
University of Turin
Cauchy recieved so much praise for his lectures he chose to publish them into 3 books:
Cours d'Analyse de l'École Polytechnique (1821, mathematics)
Le Calcul Infinitésimal (1823, mathematics)
Leçons sur les Applications de Calcul Infinitésimal; La Géométrie (1826–28, mathematics)
Plus Oeuvres complètes d'Augustin Cauchy (1882–1970) which has 27 volumes.
Published works in the Académie’s weekly bulletin, the Comptes Rendu

5. His Contribution to Mathematics
Peano existence theorem
Cauchy–Kovalevskaya theorem 
Residue Theorem
Cauchy’s Equation
Cauchy’s Integral Formula
Cauchy’s Integral Theorem
Cauchy’s Mean Value Theorem

6. Interesting Facts
Augustin was taught by his father during his childhood.
Augustin’s father, Louis François Cauchy, was friends with Joesph-Louis Lagrange and Pierre-Simon Laplace, two other famous mathematicians.
It was Lagrange and Laplace who encouraged Augustin the most to study mathematics.
His name was found in most calculus textbooks during his time.
He wrote more mathematic works than any other mathematician, except for Leonhard Euler.
He was given the privilege to teach King Charles X’s grandson.

7. Uhh…

8. “Men die but their works endure.”