I wish everything were as simple as special relativity…
The Lorentz transformation specifies the coordinates (x, y, z, t) of an given “event” in a reference frame S according to the coordinates (x’, y’, z’, t’ ) of the same event in a “mobile” reference frame moving at a constant velocity 
with respect to S along the 
-axis. It is written :
where β and γ are dimensionless factors defined by :
