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hartkp
  • Member for 13 years, 3 months
  • Last seen more than a month ago
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General Topologist and occasional Set Theorist

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5
Book reference for topology: Can I avoid filters?
Sep 24, 2018
5
The domain of $f(x) = \ln (x + \sqrt{1+ x^2}).$
Oct 4, 2018
4
Is a subbase an open cover?
Dec 30, 2022
4
$6967$ notes labelled $1,2,3,4,...,6967$,choose $K$ notes at random,the smallest number $K$ to ensure that two notes labelled by consecutive numbers?
Sep 7, 2018
4
The space $\omega_1$ of all countable ordinals is not completely uniformizable
Dec 5, 2019
4
Collection vs. set of subsets vs. set of all subsets vs. family of sets
Sep 14, 2018
4
Surjective Continuous Map
Nov 2, 2021
3
Iterated forcing and non-existance of a model $N$ such that $\langle G_n : n \in \omega \rangle \in N$ and $\text{o}(N) = \text{o}(M)$.
Sep 3, 2018
3
Prove that $|a_1+2a_2+\cdots +na_n| \le 1$ ,when $p(x)$ satisfies this condition
Sep 4, 2018
3
How to understand dyadic expansion?
Jul 13, 2022
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30
Sets with positive Lebesgue measure boundary
23
What are examples of mathematical concepts named after the wrong people? (Stigler's law)
19
Is this question about US spaces still an open problem?
17
Is Stone-Čech compactification of 0-dimensional space also 0-dimensional?
16
Partition of unity without AC