List questions from general-topology

Published on 09 Apr 2026 - 11:59

507

Views

Show a set of function is closed

Published on 16 Apr 2026 - 12:38

39

Views

Let $A$ and $B$ be separates subsets of $\mathbb R^k$ and let $a\in A$, $b\in B$

Published on 14 Apr 2026 - 18:20

80

Views

$(\mathbb{Q},|\cdot|_{\mathbb{Q}})$ is not connected

Published on 15 Apr 2026 - 17:37

205

Views

A question about Borel sets

Published on 11 Apr 2026 - 3:59

85

Views

Proving that a subset of $C[a,b]$ is of the first category

Published on 15 Apr 2026 - 23:41

574

Views

Are "most" sets in $\mathbb R$ neither open nor closed?

Published on 14 Apr 2026 - 11:55

987

Views

Is empty set with usual metric space $(X=\mathbb{R},d)$ bounded?

Published on 15 Apr 2026 - 2:37

126

Views

Why does this mean $\mathbb{R}^{\infty}$ is closed?

Published on 14 Apr 2026 - 10:20

459

Views

Munkres Topology: Section 18; Problem 8 (b)

Published on 11 Apr 2026 - 23:40

71

Views

What kinds of nets can be used to singlehandedly guarantee continuity?

Published on 09 Apr 2026 - 5:04

945

Views

$p$-adic integers $\mathbf{Z}_p$ and $\mathbf{Z}_q$ homeomorphic for $p \neq q$?

Published on 16 Apr 2026 - 9:45

34

Views

Sufficient condition to make collection of topologies a linear order

Published on 15 Apr 2026 - 4:35

176

Views

Smooth curve at the boundary - inside a closed shape

Published on 13 Apr 2026 - 1:44

2.2k

Views

Deleted comb space is not path connected

Published on 09 Apr 2026 - 5:25

List Question

Can the long line be embedded in the ordered plane?

Show a set of function is closed

Let $A$ and $B$ be separates subsets of $\mathbb R^k$ and let $a\in A$, $b\in B$

$(\mathbb{Q},|\cdot|_{\mathbb{Q}})$ is not connected

A question about Borel sets

Proving that a subset of $C[a,b]$ is of the first category

Are "most" sets in $\mathbb R$ neither open nor closed?

Is empty set with usual metric space $(X=\mathbb{R},d)$ bounded?

Why does this mean $\mathbb{R}^{\infty}$ is closed?

Munkres Topology: Section 18; Problem 8 (b)

What kinds of nets can be used to singlehandedly guarantee continuity?

$p$-adic integers $\mathbf{Z}_p$ and $\mathbf{Z}_q$ homeomorphic for $p \neq q$?

Sufficient condition to make collection of topologies a linear order

Smooth curve at the boundary - inside a closed shape

Deleted comb space is not path connected

Trending Questions

Popular # Hahtags

Popular Questions