# Is hyperbolic space metric?

## Is hyperbolic space metric?

In mathematics, a hyperbolic metric space is a metric space satisfying certain metric relations (depending quantitatively on a nonnegative real number δ) between points. Hyperbolicity is a large-scale property, and is very useful to the study of certain infinite groups called Gromov-hyperbolic groups.

Why is Beltrami Klein model not conformal?

The Beltrami–Klein model is analogous to the gnomonic projection of spherical geometry, in that geodesics (great circles in spherical geometry) are mapped to straight lines. This model is not conformal, meaning that angles and circles are distorted, whereas the Poincaré disk model preserves these.

What is conformal disk model?

In geometry, the Poincaré disk model, also called the conformal disk model, is a model of 2-dimensional hyperbolic geometry in which the points of the geometry are inside the unit disk, and the straight lines consist of all circular arcs contained within that disk that are orthogonal to the boundary of the disk, plus …

### What is hyperbolic distance?

The hyperbolic distance between two points x,y is given by coshd(x,y) = −Q(x,y). Geodesics in H+ are exactly the intersection of planes through the origin with H+.

Is hyperbolic space a manifold?

In mathematics, a hyperbolic manifold is a space where every point looks locally like hyperbolic space of some dimension. They are especially studied in dimensions 2 and 3, where they are called hyperbolic surfaces and hyperbolic 3-manifolds, respectively.

What does hyperbolic space look like?

at all points, i.e. a sphere has constant positive Gaussian curvature. Hyperbolic Spaces locally look like a saddle point. . Since each point of hyperbolic space locally looks like an identical saddle, we see that hyperbolic space has constant negative curvature.

#### Where is hyperbolic geometry used?

Hyperbolic plane geometry is also the geometry of saddle surfaces and pseudospherical surfaces, surfaces with a constant negative Gaussian curvature. A modern use of hyperbolic geometry is in the theory of special relativity, particularly the Minkowski model.

What is a hyperbolic circle?

A circle in the hyperbolic plane is the locus of all points a fixed distance from the center, just as in the Euclidean plane. Therefore, the hyperbolic plane still satisfies Euclid’s third axiom. A hyperbolic circle turns out to be a Euclidean circle after it is flattened out in the Poincare half-plane model.

How do you calculate hyperbolic length?

L ( r ) = ∫ a b 2 1 − | r ( t ) | 2 | r ′ ( t ) | d t . One can immediately check that the hyperbolic distance between two points in D corresponds to the length of the hyperbolic line segment connecting them.

## Is Pi different in hyperbolic space?

Triangles. Unlike Euclidean triangles, where the angles always add up to π radians (180°, a straight angle), in hyperbolic geometry the sum of the angles of a hyperbolic triangle is always strictly less than π radians (180°, a straight angle). The difference is referred to as the defect.

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