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comment Energy conservation in Hubble Expansion
it seems it is related to this question physics.stackexchange.com/questions/15279/…
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revised Galilean transformation of wave equation
fixed latex
Nov
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comment Galilean transformation of wave equation
Hi ... shouldn't $\frac{\partial }{\partial x'} = \frac{\partial }{\partial x} - \frac{1}{V}\frac{\partial }{\partial t}$?? could you elaborate why just $\frac{\partial}{\partial x} = \frac{\partial}{\partial x'}$ ??
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suggested approved edit on Galilean transformation of wave equation