March 2, 2016
The definition of the Principle of relativity allows misleading inaccuracies, mixing analytical thinking with not so flawless sense ideas. In fact, this principle needs the unmasking. To the purpose I will show that the movement of two systems against each other (+v,-v) is tantamount to their movement in one direction (+v,+v), (-v,-v), is equivalent to rest between them (the state of the systems is not dependent on the inverting of (-v) in (+v) and vice versa). The given definition appears a hidden form of relative peace between systems.