  We postulate the applicability of the general form-invariance principle in
special relativity. It is shown that this principle holds in classical
mechanics. Some examples of transformations between the reference frames which
satisfy this principle are considered. A new transformation is proposed for a
transition from a uniformly rotating reference frame to a reference frame whose
origin is shifted from the rotation axis. Another possible formulation of this
principle is given for the case of stationary rigid reference frames which
differ from one another only by the position of the origin.
