On differential equations texts

[mathematicsma]

I have a feeling this is the wrong place to post this. I can never figure out where to put things

Anyway, my professor uses the 4th edition of Edwards and Penney Differential Equations and Boundary Value Problems (https://www.amazon.com/gp/product/0131561073/?tag=pfamazon01-20), and I'm trying to figure out if the older editions (much cheaper) are the same. He assigns homework problems from the problem sets at the end of each section, and I need to have the right ones. If anyone here has any experience with this book, I'd appreciate it.

Alternatively, I can get the solutions manual to the book, and I'll have the problems from there, provided that a) it includes all the problems, and b) it says the questions, not just the answers.

I'm not getting the book to learn from--I've got plenty of good materials (in print and online), I just need the homeworks, and I'd prefer not to spend over $100 if I can help it. Thanks.

 

[mjpam]

You might try http://bigwords.com" that are 33%-50% off the list price.

 

[mathematicsma]

Thanks. I didn't know about that site, I might actually use it. Does anyone know anything about the differences between the different editions?

I have used books (Calculus -Larson, for example) where there are absolutely no changes from one edition to the next other than nicer graphics. Even pagination is the same.