Question

About this space subset recording form

score 36 · Answer 1 · 2026-04-15 19:48:39

36

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About this space subset recording form

Published on 15 Apr 2026 - 19:48

score 87 · Answer 2 · 2026-04-10 13:49:06

87

Views

Continuous function of $R_0$-space into non-$R_0$

Published on 10 Apr 2026 - 13:49

score 202 · Answer 3 · 2026-04-16 15:21:04

202

Views

When sigma algebra of product topology equals sigma algebra of projections

Published on 16 Apr 2026 - 15:21

score 410 · Answer 4 · 2026-04-16 13:27:23

410

Views

What manifold is produced if all similar triangles in the plane are identified?

Published on 16 Apr 2026 - 13:27

score 51 · Answer 5 · 2026-04-10 21:32:54

51

Views

A contradiction involving the compact set definition

Published on 10 Apr 2026 - 21:32

score 129 · Answer 6 · 2026-04-14 20:35:57

129

Views

Proving that Sp(2N,R) is not locally compact

Published on 14 Apr 2026 - 20:35

score 75 · Answer 7 · 2026-04-14 08:43:08

75

Views

If $A$ and $B$ are compact subsets of $\mathbb{R}$, is then $ A × B $ compact?

Published on 14 Apr 2026 - 8:43

score 80 · Answer 8 · 2026-04-30 00:11:16

80

Views

free ultrafilter

Published on 30 Apr 2026 - 0:11

score 90 · Answer 9 · 2026-04-15 10:57:24

90

Views

Show that the Zariski topology over polynomials over $Q[x_1,...,x_n]$ in $\Bbb R^n$ is not $T_1$

Published on 15 Apr 2026 - 10:57

score 584 · Answer 10 · 2026-04-16 12:29:16

584

Views

Let $f,g : X\to X$ be real continuous functions such that $f(X)\cap g(X) = \emptyset$ and $f(X)\cup g(X) = X$. Which sets cannot be equal to $X$?

Published on 16 Apr 2026 - 12:29

score 518 · Answer 11 · 2026-04-30 23:34:46

518

Views

What is the proof that first countable is sufficient to say that sequentially closed implies closed

Published on 30 Apr 2026 - 23:34

score 105 · Answer 12 · 2026-04-30 15:38:54

105

Views

Hausdorff partial metric

Published on 30 Apr 2026 - 15:38

score 46 · Answer 13 · 2026-04-14 06:10:41

46

Views

How to show that $g:2^M\to 2^\mathbb{N}$ defined by $g(A) = X\cup A$ is continuous?

Published on 14 Apr 2026 - 6:10

score 531 · Answer 14 · 2026-04-13 11:42:37

531

Views

Baby Rudin Definition 2.18

Published on 13 Apr 2026 - 11:42

score 1k · Answer 15 · 2026-04-15 00:56:35

1k

Views

Prove that lower limit and upper limit topologies on R are homeomorphic

Published on 15 Apr 2026 - 0:56

List Question

About this space subset recording form

Continuous function of $R_0$-space into non-$R_0$

When sigma algebra of product topology equals sigma algebra of projections

What manifold is produced if all similar triangles in the plane are identified?

A contradiction involving the compact set definition

Proving that Sp(2N,R) is not locally compact

If $A$ and $B$ are compact subsets of $\mathbb{R}$, is then $ A × B $ compact?

free ultrafilter

Show that the Zariski topology over polynomials over $Q[x_1,...,x_n]$ in $\Bbb R^n$ is not $T_1$

Let $f,g : X\to X$ be real continuous functions such that $f(X)\cap g(X) = \emptyset$ and $f(X)\cup g(X) = X$. Which sets cannot be equal to $X$?

What is the proof that first countable is sufficient to say that sequentially closed implies closed

Hausdorff partial metric

How to show that $g:2^M\to 2^\mathbb{N}$ defined by $g(A) = X\cup A$ is continuous?

Baby Rudin Definition 2.18

Prove that lower limit and upper limit topologies on R are homeomorphic

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