On velocities beyond the speed of light $c$

From a mathematical point of view velocities can be larger than $c$. Lorentz transformations are easily extended in Minkowski space to discuss velocities beyond the speed of light. Energy and momentum conservation fixes the relation between masses and velocities larger than $c$, and some interesting consequences are drawn. Current data make neutrinos as possible candidates for having speed larger than $c$. Assuming this is true, a well known enigma on the arrival times of the neutrino bursts from the SN1987A supernova can be explained quite naturally. Finally, experimental research is proposed to verify the theory.