Caution Dover Fanatic Here!
During this last year I've order over 45 books from Amazon. Most of them are Dover publications, the rest are Schaum's Outlines.
I'm an Amazon, Dover, Schaum's addict!
The Dover books are just so reasonably priced! I'd typically buy about 4 of them on a each topic that I'm interested in than one high-priced textbook. That way I get four different perspectives on each topic. I also include a Schaum's Outline or two on the same topic for examples of solved problems.
I think it's important to understand that I'm totally doing self-study so I don’t have any instructors to ask. I find that working through 3 or 4 books concurrently on any particular topic usually gives me a wide enough perspective that I don't have any many questions. One of the books usually answers any questions that I was left wondering about by others,…
I also find that some authors are more abstract while others tend to use more geometric or phenomenological approaches so I get a wider view of the topics in that sense as well. Or course, I also spent a
lot of time reading customer reviews and the online table of contents and excerpts that Amazon makes available on their website so I can be sure to chose books that have different points of view.
I have yet to pay shipping on any of my book orders because I always order enough books to qualify for free shipping. I don't recall what it takes to qualify but I always qualify. Or sometimes I add an printer cartridge to the order or something like that. I figure it's better to order something I need and get free shipping than to pay for the shipping.

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I've found the Dover book
Ordinary Differential Equations by Tenenbaum & Pollard to be the best self-study book on ODEs that I've ever found. It takes you step-by-step from scratch with ODEs with nice problem sets and complete answers to every problem right in the section you are working with. It's laid out in lessons instead of chapters. It's really nice for someone starting out with ODEs.
I also highly recommend
Mathematics of Classical and Quantum Physics by Byron & Fuller, but I don't recommend it as a beginner's book. It's definitely a first-year graduate book. Do Tenenbaum first,..
Well, I better quit now or I'll have listed every Dover book that I own!
By the way, I
never get any spam email from Amazon. Just be sure to
uncheck the box requesting promotional emails when you place your order. Should you forget to uncheck that box you can always cancel the promotional emails when you receive the first one by just clicking on the link to cancel them. I love Amazon, but I prefer to go to their site at my convenience so I never request their promotional emails. But you do have to
uncheck that box each time you order.
I also never got a catalog from Amazon via snail mail. Hmmm? Actually I think that'd be cool.
