The Structure of Space-Time Transformations
http://projecteuclid.org/Dienst/UI/1.0/Summarize/euclid.cmp/1103858408This theorem by H. J. Borchers and G. C. Hegerfeldt proves that the constancy of light velocity alone implies the Lorentz group (up to dilatations).
Submitted in section: Physics: Relativity: Special Relativity: The Structure of Space-Time Transformations