Henno Brandsma

Member for 14 years, 5 months
Last seen more than 2 years ago

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Answers

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72

Is $\mathbb R^3$ the square of some topological space?

Apr 2, 2011

33

Quick proofs of hard theorems

May 16, 2010

21

What is your favorite proof of Tychonoff's Theorem?

May 30, 2010

20

Locally compact Hausdorff space that is not normal

Feb 27, 2011

19

Are nets and filters useful in geometry and topology?

Jul 15, 2010

Questions

67

Non-homeomorphic spaces that have continuous bijections between them

Jul 5, 2010

9

Relatively countably compact subsets without countably compact closure.

Jul 5, 2010

4

more examples of non-weakly Lindelöf spaces

Jan 28, 2017

2

Covering properties of the rational sequence topology

Jul 16, 2017

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gn.general-topology

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set-theory

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lo.logic

43

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+10

The core question of topology

+10

Which are the rigid suborders of the real line?

+10

Question about closed projection

+10

Subset of the plane that intersects every line exactly twice

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