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Riemannian geometry information


Riemannian geometry is the branch of differential geometry that studies Riemannian manifolds, defined as smooth manifolds with a Riemannian metric (an inner product on the tangent space at each point that varies smoothly from point to point). This gives, in particular, local notions of angle, length of curves, surface area and volume. From those, some other global quantities can be derived by integrating local contributions.

Riemannian geometry originated with the vision of Bernhard Riemann expressed in his inaugural lecture "Ueber die Hypothesen, welche der Geometrie zu Grunde liegen" ("On the Hypotheses on which Geometry is Based").[1] It is a very broad and abstract generalization of the differential geometry of surfaces in R3. Development of Riemannian geometry resulted in synthesis of diverse results concerning the geometry of surfaces and the behavior of geodesics on them, with techniques that can be applied to the study of differentiable manifolds of higher dimensions. It enabled the formulation of Einstein's general theory of relativity, made profound impact on group theory and representation theory, as well as analysis, and spurred the development of algebraic and differential topology.

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Riemannian geometry

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Riemannian geometry is the branch of differential geometry that studies Riemannian manifolds, defined as smooth manifolds with a Riemannian metric (an...

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Riemannian manifold

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In differential geometry, a Riemannian manifold or Riemannian space (M, g), so called after the German mathematician Bernhard Riemann, is a real, smooth...

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Differential geometry

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example, in Riemannian geometry distances and angles are specified, in symplectic geometry volumes may be computed, in conformal geometry only angles...

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Fundamental theorem of Riemannian geometry

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mathematical field of Riemannian geometry, the fundamental theorem of Riemannian geometry states that on any Riemannian manifold (or pseudo-Riemannian manifold) there...

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Elliptic geometry

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and Bernhard Riemann leading to non-Euclidean geometry and Riemannian geometry. In Euclidean geometry, a figure can be scaled up or scaled down indefinitely...

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Embedding

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. In Riemannian geometry and pseudo-Riemannian geometry: Let ( M , g ) {\displaystyle (M,g)} and ( N , h ) {\displaystyle (N,h)} be Riemannian manifolds...

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Glossary of Riemannian and metric geometry

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This is a glossary of some terms used in Riemannian geometry and metric geometry — it doesn't cover the terminology of differential topology. The following...

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List of formulas in Riemannian geometry

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This is a list of formulas encountered in Riemannian geometry. Einstein notation is used throughout this article. This article uses the "analyst's" sign...

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Differential geometry of surfaces

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differential geometry of surfaces deals with the differential geometry of smooth surfaces with various additional structures, most often, a Riemannian metric...

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Riemann curvature tensor

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Riemannian manifolds. It assigns a tensor to each point of a Riemannian manifold (i.e., it is a tensor field). It is a local invariant of Riemannian metrics...

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Geodesic

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constant. Geodesics are commonly seen in the study of Riemannian geometry and more generally metric geometry. In general relativity, geodesics in spacetime describe...

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Symplectic geometry

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The symplectic form in symplectic geometry plays a role analogous to that of the metric tensor in Riemannian geometry. Where the metric tensor measures...

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Geometry

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manifolds and Riemannian geometry. Later in the 19th century, it appeared that geometries without the parallel postulate (non-Euclidean geometries) can be developed...

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Isometry

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metric is a Riemannian manifold, one with an indefinite metric is a pseudo-Riemannian manifold. Thus, isometries are studied in Riemannian geometry. A local...

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Ricci curvature

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differential geometry, the Ricci curvature tensor, named after Gregorio Ricci-Curbastro, is a geometric object which is determined by a choice of Riemannian or...

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Grigori Perelman

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known for his contributions to the fields of geometric analysis, Riemannian geometry, and geometric topology. In 2005, Perelman abruptly quit his research...

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Conformal geometry

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structures is sometimes termed Möbius geometry, and is a type of Klein geometry. A conformal manifold is a pseudo-Riemannian manifold equipped with an equivalence...

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Comparison theorem

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often occur in fields such as calculus, differential equations and Riemannian geometry. In the theory of differential equations, comparison theorems assert...

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Curvature of Riemannian manifolds

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In mathematics, specifically differential geometry, the infinitesimal geometry of Riemannian manifolds with dimension greater than 2 is too complicated...

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Bernhard Riemann

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combining analysis with geometry. These would subsequently become major parts of the theories of Riemannian geometry, algebraic geometry, and complex manifold...

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Information geometry

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manifolds, which are Riemannian manifolds whose points correspond to probability distributions. Historically, information geometry can be traced back to...

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Conformal map

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described by linear fractional transformations in each case. In Riemannian geometry, two Riemannian metrics g {\displaystyle g} and h {\displaystyle h} on a...

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Spacetime

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: 35  Riemannian geometry is the branch of differential geometry that studies Riemannian manifolds, defined as smooth manifolds with a Riemannian metric...

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Jeff Cheeger

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and the geometry of complete Riemannian manifolds. Journal of Differential Geometry. 17 (1982), no. 1, 15–53. On the Hodge theory of Riemannian pseudomanifolds...

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List of differential geometry topics

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differential geometry Metric tensor Riemannian manifold Pseudo-Riemannian manifold Levi-Civita connection Non-Euclidean geometry Elliptic geometry Spherical...

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