## [For the centenary of Bernhard Riemann's dissertation]. - PubMed - NCBI

This is the famous construction central to his geometry, known now as a Riemannian metric. In his dissertation, he established a geometric foundation for complex analysis through Riemann surfaces , through which multi-valued functions like the logarithm with infinitely many sheets or the square root with two sheets could become one-to-one functions.

Complex functions are harmonic functions that is, they satisfy Laplace's equation and thus the Cauchy—Riemann equations on these surfaces and are described by the location of their singularities and the topology of the surfaces. His contributions to this area are numerous.

The famous Riemann mapping theorem says that a simply connected domain in the complex plane is "biholomorphically equivalent" i. Here, too, rigorous proofs were first given after the development of richer mathematical tools in this case, topology. For the proof of the existence of functions on Riemann surfaces he used a minimality condition, which he called the Dirichlet principle. Karl Weierstrass found a gap in the proof: Riemann had not noticed that his working assumption that the minimum existed might not work; the function space might not be complete, and therefore the existence of a minimum was not guaranteed.

Through the work of David Hilbert in the Calculus of Variations, the Dirichlet principle was finally established. Otherwise, Weierstrass was very impressed with Riemann, especially with his theory of abelian functions. When Riemann's work appeared, Weierstrass withdrew his paper from Crelle's Journal and did not publish it. They had a good understanding when Riemann visited him in Berlin in Weierstrass encouraged his student Hermann Amandus Schwarz to find alternatives to the Dirichlet principle in complex analysis, in which he was successful.

An anecdote from Arnold Sommerfeld [10] shows the difficulties which contemporary mathematicians had with Riemann's new ideas. In , Weierstrass had taken Riemann's dissertation with him on a holiday to Rigi and complained that it was hard to understand. The physicist Hermann von Helmholtz assisted him in the work over night and returned with the comment that it was "natural" and "very understandable". Other highlights include his work on abelian functions and theta functions on Riemann surfaces. Riemann had been in a competition with Weierstrass since to solve the Jacobian inverse problems for abelian integrals, a generalization of elliptic integrals.

Riemann used theta functions in several variables and reduced the problem to the determination of the zeros of these theta functions. Riemann also investigated period matrices and characterized them through the "Riemannian period relations" symmetric, real part negative. Many mathematicians such as Alfred Clebsch furthered Riemann's work on algebraic curves. These theories depended on the properties of a function defined on Riemann surfaces.

- Georg Friedrich Bernhard Riemann.
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For example, the Riemann—Roch theorem Roch was a student of Riemann says something about the number of linearly independent differentials with known conditions on the zeros and poles of a Riemann surface. According to Detlef Laugwitz , [11] automorphic functions appeared for the first time in an essay about the Laplace equation on electrically charged cylinders.

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Riemann however used such functions for conformal maps such as mapping topological triangles to the circle in his lecture on hypergeometric functions or in his treatise on minimal surfaces. In the field of real analysis , he discovered the Riemann integral in his habilitation. Among other things, he showed that every piecewise continuous function is integrable. In his habilitation work on Fourier series , where he followed the work of his teacher Dirichlet, he showed that Riemann-integrable functions are "representable" by Fourier series.

Dirichlet has shown this for continuous, piecewise-differentiable functions thus with countably many non-differentiable points. Riemann gave an example of a Fourier series representing a continuous, almost nowhere-differentiable function, a case not covered by Dirichlet.

### Georg friedrich bernhard riemann Bernhard riemann habilitation dissertation

Riemann's essay was also the starting point for Georg Cantor 's work with Fourier series, which was the impetus for set theory. He also worked with hypergeometric differential equations in using complex analytical methods and presented the solutions through the behavior of closed paths about singularities described by the monodromy matrix.

The proof of the existence of such differential equations by previously known monodromy matrices is one of the Hilbert problems. He made some famous contributions to modern analytic number theory.

In a single short paper , the only one he published on the subject of number theory, he investigated the zeta function that now bears his name, establishing its importance for understanding the distribution of prime numbers. The Riemann hypothesis was one of a series of conjectures he made about the function's properties. In Riemann's work, there are many more interesting developments. He proved the functional equation for the zeta function already known to Leonhard Euler , behind which a theta function lies.

He had visited Dirichlet in From Wikipedia, the free encyclopedia. For other people with the surname, see Riemann surname. Breselenz , Kingdom of Hanover modern-day Germany. Selasca , Kingdom of Italy. Mathematics Physics. Gotthold Eisenstein Moritz A. Stern Carl W. Projecting a sphere to a plane. Outline History. Concepts Features. Line segment ray Length. Volume Cube cuboid Cylinder Pyramid Sphere. Tesseract Hypersphere. Berlin: Dudenverlag. Berlin: Walter de Gruyter.

## Bernhard Riemann

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