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gr-qc2011★ 3 cited
Space and Time models
Ll. Bel
We derive line-element's templates of space-time models with Space models complying with Helmholtz's Free mobility postulate, and discuss some of the Time models compatible with th…
gr-qc2011
Born's group and Generalized isometries
Ll. Bel
We define the Born group as the group of transformations that leave invariant the line element of Minkowski's spacetime written in terms of Fermi coordinates of a Born congruence.…