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Richard Courant (born January 8, 1888 – January 27, 1972) was a Germanmarker mathematician.


Courant was born in Lublinitzmarker in the German Empiremarker's Prussianmarker Province of Silesiamarker. During his youth, his parents had to move quite often, to Glatzmarker, Breslaumarker, and in 1905 to Berlinmarker. He stayed in Breslau and entered the universitymarker there. As he found the courses not demanding enough, he continued his studies in Zürichmarker and Göttingenmarker. Courant eventually became David Hilbert's assistant in Göttingen and obtained his doctorate there in 1910. He had to fight in World War I, but he was wounded and dismissed from the military service shortly after enlisting. After the war, in 1919, he married Nerina (Nina) Runge, a daughter of the Göttingen professor for Applied Mathematics, Carl Runge. Richard continued his research in Göttingen, with a two-year period as professor in Münstermarker. There he founded the Mathematical Institute, which he headed as director from 1928 until 1933.

Courant left Germany in 1933, earlier than many of his colleagues. While he was classified as a Jew by the Nazis, his having served as a front-line soldier exempted him from losing his position for this particular reason at the time; however, his public membership in the social-democratic left was a reason for dismissal to which no such exemption applied.[71531]

After one year in Cambridgemarker, Courant went to New York Citymarker where he became a professor at New York Universitymarker in 1936. He was given the task of founding an institute for graduate studies in mathematics, a task which he carried out very successfully. The Courant Institute of Mathematical Sciencesmarker (as it was renamed in 1964) continues to be one of the most respected research centers in applied mathematics.

Apart from his outstanding organizational talent, Courant is well remembered for his mathematical achievements. He and David Hilbert authored the influential textbook Methods of Mathematical Physics, which is still widely used more than eighty years after it was written. He was the co-author, with Herbert Robbins, of a popularization titled What is Mathematics?, which is still in print. His name is also attached to the finite element method, later reinvented by engineers. Courant gave this a solid mathematical basis. This method is now one of the ways to solve partial differential equations numerically. Courant is a namesake of the Courant–Friedrichs–Lewy condition and the Courant minimax principle.

Courant died in New York Citymarker. Richard and Nerina had four children. Ernest is a particle physicist and innovator in particle accelerators, Gertrude is a PhD biologist, Hans is a physicist who participated in the Manhattan Project, and Leonore who was a professional musician.

Perspective on mathematics

Commenting upon his analysis of experimental results from in-laboratory soap film formations, Courant believed that the existence of a physical solution does not obviate the need for mathematical proof. Here is a quote from Courant on his mathematical perspective:

Empirical evidence can never establish mathematical existence--nor can the mathematician's demand for existence be dismissed by the physicist as useless rigor. Only a mathematical existence proof can ensure that the mathematical description of a physical phenomenon is meaningful.


  1. The Parsimonious Universe, Stefan Hildebrandt & Anthony Tromba, Springer-Verlag, 1996, page 148

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