Augustin-Louis Cauchy
A mathematical architect who built the rigorous foundations of calculus and complex analysis, shaping modern engineering and physics.
1789–1857 (age 68)·French mathematician·Birthday: August 21
Biography
Augustin-Louis Cauchy insisted on airtight definitions of limits, continuity, and the integral, rebuilding calculus from the ground up and creating the field of complex analysis. Born in 1789 amid the French Revolution, the engineer turned mathematician brought precision to slippery concepts pioneered by Newton and Leibniz. His work unlocked imaginary numbers for applied science. A staunch Catholic and royalist, his political rigidity alienated colleagues, but his output was relentless: nearly 800 research papers. His name attaches to theorems across number theory, elasticity, and more, making him a foundational pillar of the discipline. He authored works that effectively rebuilt the subject where intuition once trumped proof, and his demand for rigor transformed mathematics.
#1 When Augustin-Louis Was Born
The biggest hits of 1789
Augustin-Louis's Life & Times
The world at every milestone
1789Born
1794Started school
1802Became a teenager
1805Could drive
1807Could vote
1810Turned 21
1819Turned 30
1829Turned 40
1839Turned 50
1849Turned 60
1857Died at 68
Key Achievements
- Formalized the rigorous epsilon-delta definitions central to the foundations of calculus.
- Founded the field of complex analysis with the Cauchy integral theorem and formula.
- Made pioneering contributions to the theory of permutation groups, a cornerstone of abstract algebra.
- Authored the Cauchy stress tensor, a fundamental concept in continuum mechanics.
Did You Know?
He published his first mathematical paper at the age of 21, on regular polyhedra.
His collected works, the 'Oeuvres Complètes', fill 27 volumes.
He temporarily went into exile in 1830 after refusing to swear an oath to the new French king, Louis Philippe I.
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