Lectures on advanced ordinary differential equations / K.O. Friedrichs ; notes by P. Berg, W. Hirsch [and] P. Treuenfels. Advanced ordinary differential equations. Friedrichs, K. O. (Kurt Otto), 1901-1983. Differential equations. QA372 .F85 1965 517.38 FRL Cover title: Advanced ordinary differential equations. At head of title: New York University Institute of Mathematical Sciences. Includes index. New York, Gordon and Breach London : Thomas Nelson, [c1965] c1965. [c1965] c1965. 1965 Text ix, 205 p. : eng Notes on mathematics and its applications Notes on mathematics and its applications