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KP Hart's user avatar
KP Hart's user avatar
KP Hart
  • Member for 14 years, 7 months
  • Last seen this week
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I am a general topologist and occasional set theorist

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30
Sets with positive Lebesgue measure boundary
May 26, 2010
answer
23
What are examples of mathematical concepts named after the wrong people? (Stigler's law)
May 11, 2010
answer
19
Is this question about US spaces still an open problem?
Oct 27, 2021
answer
16
Partition of unity without AC
May 17
answer
16
Is Stone-Čech compactification of 0-dimensional space also 0-dimensional?
Apr 11, 2012
answer
15
Is "compact implies sequentially compact" consistent with ZF?
Jun 23, 2010
answer
14
Is "All hyperreal fields $C(\mathbb{R})/M$ are isomorphic" independent of ZFC+$\lnot$CH?
Aug 19, 2023
answer
13
Mistake on article about Bohr compactification?
Dec 9
answer
13
What is your favorite proof of Tychonoff's Theorem?
May 30, 2010
answer
13
Are k-spaces named for Kelley?
Apr 17, 2012
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6
The domain of $f(x) = \ln (x + \sqrt{1+ x^2}).$
5
Book reference for topology: Can I avoid filters?