Textbook Recommendation for Functions I am currently in my first year introductory analysis course and I am struggling a lot with proofs for functions. I have gone through the examples in my textbook "Introduction to Real Analysis by R. Bartle and D. Sherbert" but the chapter on sets and functions wasn't long enough for me to fully comprehend it. I was wondering if anyone had any recommendations for books that go over these proofs for functions (e.g. Show that $f:A\to B$ is surjective) in more detail. Thanks!

You need a elementary book about Set theory (or Axiomatic set theory); the following books are useful to learn about that it:


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*Book of proof (Hammack). You can get this book from here. (I suggest you start with this book, page 192.)

*How to prove it (Velleman).

