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Anyone have any suggestions for a good write-up on Countability (from an intro to set theory perspective)?

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I don't get the question. –  Asaf Karagila Sep 20 '12 at 6:44
    
@ Asaf - I'm helping out in an undergraduate course in Number Theory and am looking for a good introductory write-up on Countability to give to the students as background reading. Obviously related topics would include Countability of the Rationals, but it's really just for them to get a feel of what Countability (from a Set Theory perspective) is about. Thanks for asking me to clarify. –  Conan Wong Sep 20 '12 at 17:21
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Are there any other possible perspectives? –  Henning Makholm Sep 20 '12 at 20:46

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