KP Hart

1,976
Reputation
1046 views
Is this your account?

Registered User 

Name KP Hart
Member for 2 years
Seen 3 hours ago
Website
Location Delft, the Netherlands
Age 54
I am a general topologist and occasional set theorist
1

Questions
2
7
votes
3
answers
827
views

Earliest diagonal proof of the uncountability of the reals.

may 8 10 at 23:25 John Stillwell 7,332●4●35●70

 

56

Answers
votes newest views recent
15
sets with positive Lebesgue measure boundary
12
What are examples of mathematical concepts named after the wrong people? (Stigler’s law)
8
What is your favorite proof of Tychonoff’s Theorem?
8
Does “compact iff projections are closed” require some form of choice?
8
0-dimensional locally compact space
7
Is “compact implies sequentially compact” consistent with ZF?
7
“Transitivity” of the Stone-Cech compactification
6
When factors may be cancelled in homeomorphic products?
6
Does countable compactness imply local compactness in Hausdorff spaces?
6
Independent families of subsets of $\mathbb N$ of size continuum
5
Is there a notion of a “perfectly regular” topological space?
5
Examples of common false beliefs in mathematics.
5
Products of Baire spaces
4
A question about disconnecting a Euclidean space or a Hilbert space
4
Nonmetrizable uniformities with metrizable topologies
4
Zero dimensional iff every closed set is a retract.
4
Iterated forcing and CH
4
A unique ultrafilter extending a union of filters?
4
Continuously selecting elements from unordered pairs
4
Are k-spaces named for Kelley?
3
Difference between Laver’s and Mathias’s forcing
3
Chain of ideals in a BA
3
Could $I^X$ be seen as a subspace of $I^{\beta X}$ under the compact-open topology?
3
Infinite closed partition of the real line with no closed infinite unions
3
Axiom of Choice and Vitali’s theorem
3
A “dimension” for Tychonoff spaces
3
Is there such a thing as the sigma-completion of a Boolean algebra?
3
Which topological spaces admit a nonstandard metric?
3
Relatively countably compact subsets without countably compact closure.
3
Connectedness and the real line
1 2 next

 

4

Votes
3
1

 

33

Tags
× 44
× 11
× 8
× 6
× 4
× 4
× 3
× 3
× 3
× 2
 × 2
× 2
× 2
× 2
× 2












 

11

Badges
● Yearling× 2
● Nice Answer× 2
 ● Supporter
● Commentator
 ● Critic
● Editor
 ● Student
● Autobiographer
 ● Teacher