Notation help. What do $\mathcal{P}(A)$ and $\chi_{-}$ mean here?
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Our math prof gave us this and we are not sure what to make of the notation, can someone give us a hand?
notationelementary-set-theory
asked 2010-11-10
user id: user
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@Moron: Why are you so sure that those are the two things that are causing problem? There could also be an issue with $2^A$ for that matter... – 2010-11-10
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@Arturo: I am not sure. BinaryBro can always edit the title if there is something missing. The earlier title was too generic. – 2010-11-10