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On functional bases of the first-order differential invariants for non-conjugate subgroups of the Poincaré group $P(1,4)$
(2008)
It is established which functional bases of the first-order differential invariants of the splitting and non-splitting subgroups of the Poincaré
group $P(1,4)$ are invariant under the subgroups of the extended Galilei
group ...