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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“The depth and strength of a human character are defined by its moral reserves. People reveal themselves completely only when they are thrown out of the customary conditions of their life, for only then do they have to fall back on their reserves.”
—Leon Trotsky (1879–1940)