Relativity
 Noun
The state of being relative; as, the relativity of a subject.
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Relativity
Relativity may refer to:

Geodesic (general relativity)

Newtonian motivations for general relativity
Some of the basic concepts of general relativity can be outlined outside the relativistic domain. In particular, the idea that massâ€“energy generates curvature in space and that curvature affects the motion of masses can be illustrated in a Newtonian setting. We use circular orbits as our prototype. This has the advantage that we know the kinetics of circular orbits. This allows us to calculate curvature of orbits in space directly and compare the results with dynamical forces.

Relativity Urban Assault

Relativity (Indecent Obsession album)
Relativity is the third and last studio album by Australian pop group, Indecent Obsession. Released in 1993, it is notable for minor hits such as "Fixing a Broken Heart " and "Lady Rain" in South Africa and parts of Asia, with "Fixing a Broken Heart " becoming most popular in the Philippines.

Nonexact solutions in general relativity
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de Sitter invariant special relativity
In mathematical physics, de Sitter invariant special relativity is the speculative idea that the fundamental symmetry group of spacetime is the indefinite orthogonal group SO(4,1), that of de Sitter space. In the standard theory of general relativity, de Sitter space is a highly symmetrical special vacuum solution, which requires a cosmological constant or the stressâ€“energy of a constant scalar field to sustain.

Horizon (general relativity)
A horizon is a boundary in spacetime satisfying prescribed conditions.

Physical theories modified by general relativity
This article will use the Einstein summation convention.

Nuts and bolts (general relativity)
In physics, in the theory of general relativity, spacetimes with at least a 1parameter group of isometries can be classified according to the fixed pointsets of the action. Isolated fixed points are called nuts. The other possibility is that the fixed point set is a metric 2sphere, called bolt. The number of nuts and bolts can also be related to topological invariants, such as the Euler characteristic. This classification is widely used in the analysis of gravitational instantons.