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## Main Question or Discussion Point

I read the Lorentz transformation can be obtained by solving the requirement of invariance of the wave equation. If one considers linear transformations this the same as the spacetime interval squared to be invariant.

What are the other nonlinear transformations keeping the wave equation invariant ?

In particular shall solutions of general relativistic problems give one of those transformations ?

What are the other nonlinear transformations keeping the wave equation invariant ?

In particular shall solutions of general relativistic problems give one of those transformations ?