We have two relativity theories so far-- Einstein's special and general theories dealing respectively with observers in inertial and non-inertial frames. There have been other relativity proposals like quantum relativity, scale relativity etc. I have made a classification of all possible relativity in general in a recent upload to RG. I find that there can be eight relativities in all -- four objective and four subjective. Do you have any more to add or is my classification exhaustive?

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