ISBN-13: 9781468493351 / Angielski / Miękka / 2013 / 251 str.
ISBN-13: 9781468493351 / Angielski / Miękka / 2013 / 251 str.
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."