In general relativity, does momentum conservation mean conservation of 4-momentum or 3-momentum
Conservation of 4 momentum includes the conservation of 3 momentum, the conservation of energy, and the conservation of mass
I know that. But I am asking the definition of the phrase "Momentum conservation" in the context of GR. Does it mean 4- or 3-momentum conservation?
I don't think there is a general rule. Each author should clarify their meaning
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