It should be about notion of sets, function, eq. rel. etc.
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Enderton, Elements of Set Theory. – Mauro ALLEGRANZA Aug 02 '17 at 10:06
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Goldrei, Classic Set Theory. – Mauro ALLEGRANZA Aug 02 '17 at 10:07
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Namely, I see baby set theory – Aug 02 '17 at 10:09