📓 Excerpt from Journal de Mathématiques Pures Et Appliquées, Vol. 7: Année 1891L'un des Chapitres les plus importants de la nouvelle théorie, celui de la déformation, conduit, a l'aide des notions de courbure géodésique et de courbure proprement dite, à des résultats d'une extrême éle'About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.