01084nam a2200193Ia 4500 CTU_19419 210402s9999 xx 000 0 und d 515.35 J65 Fritz John (1910- Partial differential equations (with 25 figures) Fritz John (1910- New York Spriger-Verlag 1981 The book identifies the significant aspects of the theory and explores them with a limited amount of machinery from mathematical analysis. It discusses real functions of several variables, the Cauchy-Kowalevski theorem, a second proof foe existence of solutions of the initial value problem for symmetric hyperbolic systems, solutions of the Dirichlet problem in higher dimension, a proof of Widder's theorem on non-negative solutions of the equation. Finally, the book presents H. Lewy's construction of a linear differential equation without solutions differential equations, partial Minh, 971031 Trung tâm Học liệu Trường Đại học Cần Thơ