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18
sets with positive Lebesgue measure boundary
12
What are examples of mathematical concepts named after the wrong people? (Stigler’s law)
10
“Transitivity” of the Stone-Cech compactification
9
0-dimensional locally compact space
8
Independent families of subsets of $\mathbb N$ of size continuum
8
Is “compact implies sequentially compact” consistent with ZF?
8
What is your favorite proof of Tychonoff’s Theorem?
8
Does “compact iff projections are closed” require some form of choice?
7
Does countable compactness imply local compactness in Hausdorff spaces?
7
When factors may be cancelled in homeomorphic products?
7
Are k-spaces named for Kelley?
5
Is there a notion of a “perfectly regular” topological space?
5
Products of Baire spaces
5
Examples of common false beliefs in mathematics.
5
Continuously selecting elements from unordered pairs
4
Zero dimensional iff every closed set is a retract.
4
Iterated forcing and CH
4
A question about disconnecting a Euclidean space or a Hilbert space
4
Nonmetrizable uniformities with metrizable topologies
4
A unique ultrafilter extending a union of filters?
4
Could $I^X$ be seen as a subspace of $I^{\beta X}$ under the compact-open topology?
3
Chain of ideals in a BA
3
Infinite closed partition of the real line with no closed infinite unions
3
Difference between Laver’s and Mathias’s forcing
3
Axiom of Choice and Vitali’s theorem
3
Local convexity of C([a,b])
3
Is there such a thing as the sigma-completion of a Boolean algebra?
3
A “dimension” for Tychonoff spaces
3
What does the property that path-connectedness implies arc-connectedness imply?
3
Which topological spaces admit a nonstandard metric?
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