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A problem on infinite dimensional metric space
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Bijective-equivalent collections of proper classes in set theory
What sort of axiomatization are you thinking of for NBG/MK? I think the most common axiomatizations include (or imply) Limitation of Size, which says that a class is proper iff it admits an injection from V, and from which you then get Global Choice. |
Feb 20 |
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How to see such space is Lindelof?
@John: Do you mean my characterisation of the open subsets of $\mathbb{R}_B$? (Which follows from the fact that the topology generated by the usual open subsets of $\mathbb{R}$ and the singletons from $B$.) Or that there is a countable $I_0$? (Which follows from the fact that $\mathbb{R}$ is second-countable, and thus hereditary Lindelöf.) |
Feb 20 |
answered | How to see such space is Lindelof? |
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A function that is defined everywhere but has unknown values
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Sep 14 |
answered | A function that is defined everywhere but has unknown values |