Analysis given above shows that:
1. Inertial principle may be formulated not in ``external" munner as usual but, say, ``internally" with the reference to the ``physical state" that is assumed to be stationary under inertial motion.
2. ``Quantum states and their deformations may serve as...
The fundamental question about the nature of inertial mass is not solved up to now.
Success of Newton's conception of physical force influencing on a separated body may be explained by the fact that the \emph{geometric counterpart to the force - acceleration in some inertial frame} was found...