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I'm trying to increase my skill with proofs and at least one of my bottlenecks is skill with set theory proofs. What are good largish sources of practice problems for set theory proofs (with answers if possible)?

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    Your question is vague because lots of people inquiring about this mean the sort of thing taught under the heading of "set theory" in very elementary courses, where you do algebra with unions, intersections, complements, etc., whereas others have in mind things like transfinite ordinals, etc. What level do you have in mind?2011-10-07

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