I have just completed my first year study and know elementary analysis and a little bit functional analysis. I found that most of the ODE books just focus on calculation but no substantial explanation of theorems.Can someone suggest some ODE books which are from a more theoretical point of view?
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Possible duplicate: http://math.stackexchange.com/questions/34233/ode-introduction-textbook – Belgi Jul 27 '12 at 16:37
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Its not an ODE book, and it be heavy going at an early stage, but I like the (brief) treatment of ODEs in Kantorovich & Akilov's "Functional Analysis". In particular, it provides a fixed-point scheme (as in Picard) that is useful for showing continuity of solutions with respect to parameters. – copper.hat Jul 27 '12 at 17:30
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The Qualitative Theory of Ordinary Differential Equations by Brauer and Nohel is worth a look. – littleO May 10 '23 at 06:05
4 Answers
A classical theoretical book on ODE is Hartman.
A very good book, and slightly less demanding than Hartman is Hale's book
A geometric picture of differential equations is given in two Arnold's books: one and two
ODE from a dynamical system theory point of view are presented in Wiggins' book
Update: Have no idea how, but I read that the question was about a second theoretical ODE course. For the first course in ODE none of the books that I mentioned (except Arnold's one) suits.
The best first theoretical book on ODE is, for my taste, is Hirsch and Smale.

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2Hartman is great for references, but I would kill myself if I had to use it for self-study as my first ODE course. Arnold's books make excellent reading. – Jul 27 '12 at 20:13
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@LeonidKovalev Ups. Somehow I understood that OP asked about a second course in differential equations. I update my post. – Artem Jul 29 '12 at 15:05
You might try Birkhoff and Rota or Lefschetz or Nemytskii and Stepanov.

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You can try this one also...
'Differential Equations Theory, Technique and Practice' by G. F. Simmons & S. G. Krantz (McGraw Hill Higher Education)

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Try lecture notes by Alexander Grigorian and Peter Philip. These are the most rigorous texts on ODE I have read.

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