Differentialgleichungen erster Ordnung, by Wallie Abraham Hurwitz 33330 [Full title: Randwertaufgaben bei Systemen von linearen partiellen Differentialgleichungen erster Ordnung] [Language: German] [Link: http://www.gutenberg.org/3/3/3/3/33330 ] [Files: 33330-t.tex; 33330-pdf.pdf] Thanks to Andrew D. Hwang, Ralf Stephan, Joshua Hutchinson and the Online Distributed Proofreading Team at http://www.pgdp.net (This file was produced from images from the Cornell University Library: Historical Mathematics Monographs collection.) David