GOURSAT, Leçons sur l’Intégration des Équations Dérivées Partielles, 1896-1898

First edition.
Presentation copy to Emile Picard (1856-1941).
Goursat and Picard were of the same generation and had known each other since their student days (Henri IV then ENS). In November 1897, Goursat succeeded Picard as full professor of the chair of differential and integral calculus at the Faculty of Sciences in Paris.