Here's an interesting book to consider: https://www.amazon.com/Advanced-Engineering-Mathematics-Mathur-Prof/dp/9387394360/ https://www.amazon.com/Advanced-Engi

Here's an interesting book to consider: https://www.amazon.com/Advanced-Engineering-Mathematics-Mathur-Prof/dp/9387394360/ https://www.amazon.com/Advanced-Engineering-Mathematics-Math... https://www.amazon.in/Advanced-Engineering-Mathematics-Mathur-Jaggi/dp/B00UJIG6QU https://www.amazon.in/Advanced-Engineering-Mathematics-Mathu... https://khannapublishers.in/index.php?route=product/product&product_id=240 https://khannapublishers.in/index.php?route=product/product&... (This sells in India for a mere US $4. Costlier elsewhere.) Pros: * This has the most exhaustive catalog of differential equations and methods to solving them that I have ever seen. An example would be the discussion on non-homogenous differential equations that I have never seen anywhere else at all. * While the subject matter is not easy, the book is complete in itself. A reader would not be led into a "dependency hell" or worse a cyclic dependencies of other materials to read. Cons: * Very low quality typesetting, print and paper quality. I wish a improved edition could be in the pipeline, however, the book is rather out of print. * The book is not focused on differential equations. The other material covered is however a bonus. Note: The authors were professors at my engineering college. Am however not associated with them in any way and I have no vested interest in recommending the book.