Am Donnerstag, 5. März 2009 13:09 schrieb Peter Verswyvelen: > Ha. There's even a wiki page on the paradoxes of set theory > http://en.wikipedia.org/wiki/Paradoxes_of_set_theory > > If I recall correctly, a math professor once told me that it is not yet > proven if the cardinality of the power set of the natural numbers is larger > or smaller or equal than the cardinality of the real numbers... But that > is many many years ago so don't shoot me if I'm wrong :) >
In standard NBG set theory, it is easy to prove that card(P(N)) == card(R). _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
