The tenets of Riemannian geometry, however, admit the other three Euclidean postulates compare hyperbolic geometry.

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Although some of the theorems of Riemannian geometry are identical to those of Euclidean, most differ. In Euclidean geometry , for example, two parallel lines are taken to be everywhere equidistant. In elliptic geometry, parallel lines do not exist. In Euclidean, the sum of the angles in a triangle is two right angles; in elliptic, the sum is greater than two right angles. In Euclidean, polygons of differing areas can be similar; in elliptic, similar polygons of differing areas do not exist.

## Riemannian Geometry IV

The first published works on non-Euclidean geometries appeared about Such publications were unknown to the German mathematician Bernhard Riemann who, in , extended the concepts from two to three or more dimensions. Another German mathematician, Felix Klein , later discriminated between elliptical space polar and double-elliptical space antipodal.

Riemannian geometry. The awkward case of 'his or her'. Which of these things doesn't belong?

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Test your knowledge - and maybe learn something along the way. Riemannian geometry noun.

Definition of Riemannian geometry. First Known Use of Riemannian geometry , in the meaning defined above.

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## Strichartz : Sub-Riemannian geometry

History and Etymology for Riemannian geometry German F. Learn More about Riemannian geometry. Resources for Riemannian geometry Time Traveler! Explore the year a word first appeared. Statistics for Riemannian geometry Look-up Popularity.

## Riemannian geometry

Time Traveler for Riemannian geometry The first known use of Riemannian geometry was in See more words from the same year. It has a model on the surface of a sphere, with lines represented by great circles. Also called: elliptic geometry. Switch to new thesaurus.

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Mentioned in? References in periodicals archive?

The features are extracted by using the Riemannian geometry [14], which manipulates the covariance matrices of the MEG signals. A deep neural network classifier for decoding human brain activity based on magnetoencephalography.

Yamabe solitons on three-dimensional Kenmotsu manifolds.