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Principle of relativity
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===General relativity=== {{main|General relativity}} General relativity was developed by Einstein in the years 1907β1915. General relativity postulates that the [[Symmetry (physics)#Local and global|global]] [[Lorentz covariance]] of special relativity becomes a [[Symmetry (physics)#Local and global|local]] Lorentz covariance in the presence of matter. The presence of [[matter]] "curves" [[spacetime]], and this [[curvature]] affects the path of free particles (and even the path of light). General relativity uses the mathematics of [[differential geometry]] and [[tensor]]s in order to describe [[gravitation]] as an effect of the [[geometry]] of [[spacetime]]. Einstein based this new theory on the general principle of relativity and named the theory after the underlying principle.
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