Lectures on ordinary differential equations. Hurewicz, Witold, 1904-1956. Differential equations. QA372 .H93 1958 517.38 HUL First published in 1943 under title: Ordinary differential equations in the real domain with emphasis on geometric methods. [Cambridge] Technology Press of the Massachusetts Institute of Technology 1958. 1958. 1958 Text 122 p. : eng Technology Press books in science and engineering