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Since speed is relative, it follows that two observers in different inertial reference frames may disagree on the mass and kinetic energy of a body. Since all inertial reference frames are treated on an equal footing, it follows that mass and energy are interchangeable.
 
Since speed is relative, it follows that two observers in different inertial reference frames may disagree on the mass and kinetic energy of a body. Since all inertial reference frames are treated on an equal footing, it follows that mass and energy are interchangeable.
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==General Relativity==
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The GR field equations are
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:<math> G_{uv} = 8\pi\, T_{uv} </math>
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where ''G<sub>uv</sub>'' is the [[Einstein curvature tensor]], and ''T<sub>uv</sub>'' is the [[stress-energy tensor]], ''G<sub>uv</sub>'' and ''T<sub>uv</sub>'' are both rank 2 symmetric tensors.  The GR field equations is a system of [[partial differential equations]] that relates the curvature of space to the mass occupying the space.
      
==Evidence for Relativity==
 
==Evidence for Relativity==
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