Excerpt from Leçons sur l'Intégration des Équations aux Dérivées Partielles du Second Ordre A Deux Variables Indépendantes, Vol. 2: La Méthode de Laplace, les Systèmes en Involution, la Méthode de M. Darboux, les Équations de la Première Classe, Transformations des Équations du Second Ordre, Généralisations Diverses M. Bourlet et mon éditeur, M Hermann. M'ont continué pour ce second volume le concours qu iis m'avaient prèté pour le pre mier. M. E. Cosserat, qui a pris une part active à la correction des épreuves, m'a soumis sur plusieurs points des remarques tout j'ai profité pour ma rédaction. M. Léonce Laugel, bien connu du public mathématique par les nombreuses traductions qu'il a déjà publiées, a bien voulu traduire pour moi plusieurs mémoires importants. Je leur adresse à tous mes all'ectueux remerciements. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This 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.

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