Noun
(mathematics) a non-Euclidean geometry that regards space as like a sphere and a line as like a great circle
Source: WordNetBernhard Riemann pioneered elliptic geometry Source: Internet
An exact replacement of Whitehead's cosmology would need to admit a Riemannian geometry. Source: Internet
By contrast with Riemannian geometry, where the curvature provides a local invariant of Riemannian manifolds, Darboux's theorem states that all symplectic manifolds are locally isomorphic. Source: Internet
Riemannian geometry generalizes Euclidean geometry to spaces that are not necessarily flat, although they still resemble the Euclidean space at each point infinitesimally, i.e. in the first order of approximation. Source: Internet