Question

Not every Urysohn space is semi-regular

score 77 · Answer 1 · 2021-01-22 10:09:13

77

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Not every Urysohn space is semi-regular

Published on 22 Jan 2021 - 10:09

score 42 · Answer 2 · 2021-01-26 13:42:27

42

Views

Horst Herrlich, Topology I: $T_{3 \frac{1}{2}}$-Reflection and continuous maps.

Published on 26 Jan 2021 - 13:42

score 176 · Answer 3 · 2021-02-02 14:08:27

176

Views

Why does the $T_1$ Axiom imply that a point is a closed set?

Published on 02 Feb 2021 - 14:08

score 56 · Answer 4 · 2021-02-09 13:30:11

56

Views

Is the punctured plane a normal space? Is a normal space without a point normal?

Published on 09 Feb 2021 - 13:30

score 341 · Answer 5 · 2021-02-10 10:42:32

341

Views

Separating a compact set from a closed set in $T_2$ and locally compact

Published on 10 Feb 2021 - 10:42

score 33 · Answer 6 · 2021-02-11 16:45:06

33

Views

Closed subset with derived set non closed

Published on 11 Feb 2021 - 16:45

score 50 · Answer 7 · 2021-02-17 07:38:01

50

Views

Whether Hausdorff Property is Required

Published on 17 Feb 2021 - 7:38

score 298 · Answer 8 · 2021-02-28 11:10:17

298

Views

An example of a Hausdorff topological group which is not normal

Published on 28 Feb 2021 - 11:10

score 291 · Answer 9 · 2021-03-03 19:33:38

291

Views

Prove that Y is Hausdorff iff X is Hausdorff and A is a closed subset of X

Published on 03 Mar 2021 - 19:33

score 86 · Answer 10 · 2021-03-05 18:45:04

86

Views

Is there a non-Hausdorff space being a union of a countable increasing chain of "nice" spaces?

Published on 05 Mar 2021 - 18:45

score 47 · Answer 11 · 2021-03-06 16:03:33

47

Views

which of these is a Hausdorff Space?

Published on 06 Mar 2021 - 16:03

score 122 · Answer 12 · 2021-03-06 20:47:42

122

Views

Quotient of completely regular space that is not completely regular

Published on 06 Mar 2021 - 20:47

score 164 · Answer 13 · 2021-03-11 03:49:35

164

Views

Find a Quotient of Hausdorff spaces not is Hausdorff

Published on 11 Mar 2021 - 3:49

score 46 · Answer 14 · 2021-03-12 07:59:58

46

Views

How to make this construction rigorous, in order to prove that a topological space being normal and $T_1$ implies it being completely regular?

Published on 12 Mar 2021 - 7:59

score 41 · Answer 15 · 2021-03-21 08:23:17

41

Views

All hausdorff spaces normal: Find flaw in proof

Published on 21 Mar 2021 - 8:23

List Question

Not every Urysohn space is semi-regular

Horst Herrlich, Topology I: $T_{3 \frac{1}{2}}$-Reflection and continuous maps.

Why does the $T_1$ Axiom imply that a point is a closed set?

Is the punctured plane a normal space? Is a normal space without a point normal?

Separating a compact set from a closed set in $T_2$ and locally compact

Closed subset with derived set non closed

Whether Hausdorff Property is Required

An example of a Hausdorff topological group which is not normal

Prove that Y is Hausdorff iff X is Hausdorff and A is a closed subset of X

Is there a non-Hausdorff space being a union of a countable increasing chain of "nice" spaces?

which of these is a Hausdorff Space?

Quotient of completely regular space that is not completely regular

Find a Quotient of Hausdorff spaces not is Hausdorff

How to make this construction rigorous, in order to prove that a topological space being normal and $T_1$ implies it being completely regular?

All hausdorff spaces normal: Find flaw in proof

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