Pfaff’s problem.
Goursat, Edouard Jean Baptiste, 1858- **F5129.244 Lecons sur le probléme de Pfaff. — Paris. Herman. 1922. iii—viii, 386, (1) pp. 2414 cm., in 8s.
This card was printed at the Boston Public Library, December 3, 1922. M7566 — Differential equations. — term.
 
aff’s problem. — Analysis. Mathematical