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Are there any problem book series on different topics with proper solutions? I have already found some in analysis (Problems in Mathematical Analysis 1-3) but not any in less popular topics.

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    From my experience, most books contain problem sets of their own. Why not use them? I there any area in particular you need problems for? Also, if you told us the purpose for which you need them, that would probably help people to give a relevant answer.2012-08-22
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    In my opinion, Paul Halmos' _A Hilbert Space Problem Book_ is an excellent text for an entrance into operator theory.2012-08-22

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