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in which special relativity applies locally. The term "relativity" was coined by Max Planck in 1908 to emphasize how special relativity (which at that time was the only relativity theory) uses the Principle Of Relativity . Special relativity See Also: Special relativity Albert Einstein's 1905 paper " On The Electrodynamics Of Moving Bodies " introduced the ''special theory of relativity'', but the underlying mathematics to Einstein's work rest on a series of mathematics papers published between 1900 and 1905 by Henri Poincaré . Einstein acknowledged Poincaré's contributions in the text of a lecture in 1921 called ''Geometrie und Erfahrung''. Later Einstein commented on Poincaré as being one of the pioneers of relativity: :"Lorentz had already recognized that the transformation named after him is essential for the analysis of Maxwell's equations, and Poincaré deepened this insight still further ..." Special relativity considers that observers in Inertial Reference Frame s, which are in uniform motion relative to one another, cannot perform any experiment to determine which one of them is "stationary". This is known as the Principle Of Relativity . While this principle was not new to Albert Einstein's work, he found that including Electromagnetism in this principle required a new formalism with many surprising consequences. In particular, it required the Speed Of Light in a Vacuum to be the same for all these observers, regardless of their motion or the motion of the source of the Light . One of the strengths of special relativity is that it can be derived from only two premises:
General relativity See Also: General relativity General relativity was developed by Einstein in the years 1911 - 1915 . General relativity is a geometrical theory which postulates that the presence of Matter "curves" Spacetime , and this Curvature affects the path of free particles (and even the path of light). It uses the mathematics of Differential Geometry and Tensor s in order to describe Gravitation without the use of the force of Gravity . This theory considers all observers to be equivalent, not only those moving with uniform speed. See also
References See the Special Relativity References and the General Relativity References . External links
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