<P> 1 . First Postulate (Principle of relativity) </P> <Dl> <Dd> Under transitions between inertial reference frames, the equations of all fundamental laws of physics stay form - invariant, while all the numerical constants entering these equations preserve their values . Thus, if a fundamental physical law is expressed with a mathematical equation in one inertial frame, it must be expressed by an identical equation in any other inertial frame, provided both frames are parameterised with charts of the same type . (The caveat on charts is relaxed, if we employ connections to write the law in a covariant form .) </Dd> </Dl> <Dd> Under transitions between inertial reference frames, the equations of all fundamental laws of physics stay form - invariant, while all the numerical constants entering these equations preserve their values . Thus, if a fundamental physical law is expressed with a mathematical equation in one inertial frame, it must be expressed by an identical equation in any other inertial frame, provided both frames are parameterised with charts of the same type . (The caveat on charts is relaxed, if we employ connections to write the law in a covariant form .) </Dd> <P> 2 . Second Postulate (Invariance of c) </P>

What is the basic postulates of special theory of relativity