Book recommendation for ordinary differential equations This question has been posted before, but I need book with specific qualifications. I do not need books for engineers, book that is centered around calculations and stuff. I need to find a book that is theoretical, proves the statements and has good presentation of the theoretical structure. I have had the book by Tenenbaum, I did not like it. I would be very very thankful if someone shared their knowledge with us about this matter. 

You could always try Ordinary Differential Equations by Tenenbaum. It's very comprehensive and thorough.
http://www.amazon.com/Ordinary-Differential-Equations-Dover-Mathematics/dp/0486649407/ref=sr_1_1?ie=UTF8&qid=1416423343&sr=8-1&keywords=differential+equation+tenenbaum
