Non-Euclidean geometry and the rotating disk Einstein's formulation of special relativity was in terms of kinematics (the study of moving bodies without reference to forces).
<meaning-changed> Non-Euclidean geometry and the rotating disk Einstein's formulation of special relativity was in terms of kinematics (the study of moving bodies without reference to forces).
Early applications of the equivalence principle Einstein's formulation of special relativity was in terms of kinematics (the study of moving bodies without reference to forces).