http://www.physicstoday.org/vol-60/iss-1/12_2.html :
"Why no Einstein's laws? Since my undergraduate days, I have been puzzled by the fact that we have Newton's laws of motion but only Einstein's theory of special relativity. We have finished celebrating the 100th anniversary of the publication of the theory of special relativity, and it seems to me that after a century of validation, it's time to rename it as more than just a theory. I propose that we, as physicists, define a set of Einstein's laws, just as we have Newton's laws, Coulomb's law, or Faraday's law. I begin the discussion by offering the following three laws: The laws of physics are identical in all non-accelerating (that is, inertial) frames. The vacuum speed of light, c, is the same for all inertial frames. The total energy E of a body of mass m and momentum p is given by E = [–m2c4 + p2c2]. In particular, the energy of a body measured in its own rest frame is given by E = mc2, and the energy of a massless body is E = pc."
Consider again Einstein's Second Law:
Einstein's Second Law (original version): "The vacuum speed of light, c, is the same for all inertial frames." (In fact, the original 1905 version of Einstein's Second Law was a bit different but this is irrelevant here.)
This extremely important Law was improved by Einstein himself in the following way:
Einstein's Second Law (improved): The observer's frame may be inertial but if the observer and the light source are at different gravitational potentials, the speed of light is variable and obeys the equation c'=c(1+V/c^2), where V is the gravitational potential relative to the light source.
This improved version of Einstein's Second Law was gloriously confirmed in 1960 when Pound and Rebka measured a gravitational redshift factor equal to 1+V/c^2. Then clever Einsteinians deduced the ultimate version of Einstein's Second Law:
Einstein's Second Law (ultimate version): If the relative speed of the observer and the emitting body is zero, light is always propagated in empty space with a variable speed c'=c(1+V/c^2) where c is the initial speed of photons relaive to the emitting body and V is the gravitational potential relative to the place of emission. Equivalently, if the observer and the place of emission are at the same gravitational potential, light is always propagated in empty space with a variable speed c'=c+v where v is the relative speed of the observer and the emitting body.
Clever Einsteinians were going to inform the world about the ultimate version of Einstein's Second Law but suddenly they realised the ultimate version was incompatible with the original version. The money-spinner called the theory of relativity was in danger so clever Einsteinians postponed the publication of the ultimate version until some new money-spinner was devised.
Pentcho Valev