Conversely, if this condition be satisfied, an infinitesimal deformation is possible.
Many forms of deformation, it may be remarked in passing, emphasize some natural physical characteristic of the people who practise them.
In any infinitely small deformation of the frame as thus modified, the virtual work of the forces 5, together with that of the original extraneous forces, must ~ranish this determines S.
(1900) P. 46; Marcel Bertrand, " Deformation tetraedrique de la terre et deplacement du pole," Comptes rendus Acad.
This epoch of great deformation and warping marks the transition from the Tertiary to the Quaternary.