## Leibnizian , Galilean and Newtonian structures of space – time a ...

- Antonio N. Bernal, Miguel Sánchezb
- 2003

@inproceedings{Bernal2002OC2, title={O ct 2 00 2 Fundamental units of length and time}, author={Antonio N. Bernal and M. P. L{\'o}pez and Marcelo S{\'a}nchez}, year={2002} }

- Published 2002

Ideal rods and clocks are defined as an infinitesimal symmetry of the spacetime, at least in the non-quantum case. Since no a priori geometric structure is considered, all the possible models of spacetime are obtained.

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