This book is a very well-accepted introduction to the subject. In it, the author identifies the significant aspects of the theory and explores them with a limited amount of machinery from mathematical analysis. Now, in this fourth edition, the book has again been updated with an additional chapter on Lewy's example of a linear equation without solutions.

  • ISBN10 0387903275
  • ISBN13 9780387903279
  • Publish Date 17 July 1980 (first published 4 February 1971)
  • Publish Status Out of Print
  • Out of Print 10 May 2014
  • Publish Country US
  • Imprint Springer
  • Edition 3rd ed.
  • Format Hardcover
  • Pages 198
  • Language English