The present paper represents the simplest proof that the general relativity
principle does not come to the particular relativity principle in case of
inertial motion in an empty space. It admits an existence of phenomena, whe
re a violation of the particular relativity principle occurs within the sco
pe of the general relativity principle. Under modern development of experim
ental techniques, a search of such hypothetical phenomena can be made only
by means of the Mossbauer effect. A scheme of possible experiment has been
proposed.