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Camille Jordan

mathematics
Henri Léon Lebesgue and the Theory of Integration

Henri Léon Lebesgue and the Theory of Integration

Harald Sack
On June 28, 1875, French mathematician Henri Léon Lebesgue was born. He is best known for his theory of integration, which was a generalization of the 17th century concept of integration, i.e. summing the area between an axis and the curve of a function defined for that axis. By extending the work of Camille Jordan and Émile Borel on the Riemann integral, Lebesgue provided a generalization that solved many of the difficulties…
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mathematics
Oswald Veblen and Foundations of modern Topology

Oswald Veblen and Foundations of modern Topology

Harald Sack
On June 24, 1880, American mathematician, geometer and topologist Oswald Veblen was born. Veblen‘s work found application in atomic physics and the theory of relativity. He proved the Jordan curve theorem in 1905 while this was long considered the first rigorous proof, many now also consider Jordan‘s original proof rigorous. “Mathematics is one of the essential emanations of the human spirit, a thing to be valued in and for itself, like art…
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mathematics
Camille Jordan and the Cours d’Analyse.

Camille Jordan and the Cours d’Analyse.

Harald Sack
On January 5, 1838, French mathematician Marie Ennemond Camille Jordan was born. Jordan is known both for his foundational work in group theory and for his influential Cours d’analyse. “[I was advised] to read Jordan’s ‘Cours d’analyse’; and I shall never forget the astonishment with which I read that remarkable work, the first inspiration for so many mathematicians of my generation, and learnt for the first time as I read it what…
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mathematics
Sophus Lie and the Theory of Continuous Symmetry

Sophus Lie and the Theory of Continuous Symmetry

Harald Sack
On December 17, 1842, Norwegian mathematician Sophus Lie was born. Lie largely created the theory of continuous symmetry and applied it to the study of geometry and differential equations. He made significant contributions to the theories of algebraic invariants, continuous groups of transformations and differential equations. Lie groups and Lie algebras are named after him. “In our century the conceptions substitution and substitution group, transformation and transformation group, operation and operation group,…
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