Coordinate Conditions
In general relativity, the laws of physics can be expressed in a generally covariant form. In other words, the real world does not care about our coordinate systems. However, it is often useful to fix upon a particular coordinate system, in order to solve actual problems or make actual predictions. A coordinate condition selects such coordinate system(s).
Read more about Coordinate Conditions: Indeterminacy in General Relativity, Harmonic Coordinates, Synchronous Coordinates, Other Coordinates, Lorentz Covariant Coordinate Conditions
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