I'm a senior undergraduate Pure Math student. I'm looking for books/ problems about large/infinite cardinals and infinite sets. Unsolved or challenging problems are very much welcome.
It shouldn't be anything to technical but I usually like books with lots of demonstrations and nothing too constructive.
To give you some background on what I've studied, I have learnt the ZFC axioms, some theory about Von Neumann ordinals, cardinal arithmetic, the aleph numbers, the continuum hypothesis, etc... I had two Algebra Courses last year and I'm taking Set theory now. Can anyone recommend me good references on this? I want to star working on this subject to later develop a theme to research.
Thank you