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Now, when reading about Special Relativity, some books says that prior to Einstein there was one "principle of relativity" that could be stated as follows: The laws of Mechanics are invariant in every inertial reference frame That is not the best formulation, since constancy of laws is already assumed implicitly. What is meant by the ...


I recently read a paper on the possible kinematics: http://scitation.aip.org/content/aip/journal/jmp/9/10/10.1063/1.1664490 It states that under the 3 assumptions they made, there were more then 10 possible Lie-Algebras (while they discarded one by heuristic arguments)

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