Question

Confusion between finite set and countable set?

score 1.7k · Answer 1 · 2026-04-10 12:11:15

1.7k

Views

Confusion between finite set and countable set?

Published on 10 Apr 2026 - 12:11

score 38 · Answer 2 · 2026-04-15 03:50:44

38

Views

Sheaf on a point space is always the skyscaper sheaf

Published on 15 Apr 2026 - 3:50

score 342 · Answer 3 · 2026-04-16 15:06:30

342

Views

Find the supremeum and infimum, and is the set compact?

Published on 16 Apr 2026 - 15:06

score 37 · Answer 4 · 2026-04-15 23:26:51

37

Views

There exists a countable collection of sets $E_i$ with open union such that $\text{diam }E_i<\epsilon$ and $A \subset \bigcup E_i$

Published on 15 Apr 2026 - 23:26

score 45 · Answer 5 · 2026-04-13 22:07:25

45

Views

If $B$ is a subbasis for $T$, $B'$ for $T'$, $C:= B \times B'$ is closed under intersections

Published on 13 Apr 2026 - 22:07

score 611 · Answer 6 · 2026-04-10 23:26:18

611

Views

Can the topology generated from the lexicographic order on $\mathbb{R}^2$ come from a metric?

Published on 10 Apr 2026 - 23:26

score 47 · Answer 7 · 2026-04-16 16:36:13

47

Views

The sum of a completely continuous function with a contraction is a condensing function?

Published on 16 Apr 2026 - 16:36

score 111 · Answer 8 · 2026-04-11 16:09:54

111

Views

Proving two outer measures defined on the unit circle $C$ are the same measure.

Published on 11 Apr 2026 - 16:09

score 110 · Answer 9 · 2026-04-09 08:34:56

110

Views

Is every set metrisable?

Published on 09 Apr 2026 - 8:34

score 205 · Answer 10 · 2026-04-13 06:53:46

205

Views

Showing the limit points of E are equal to the limit points of E closure.

Published on 13 Apr 2026 - 6:53

score 70 · Answer 11 · 2026-04-12 14:07:54

70

Views

How to use Lebesgue number lemma?

Published on 12 Apr 2026 - 14:07

score 194 · Answer 12 · 2026-04-13 18:36:03

Satisfying the union of open sets axiom to prove unions of finite intersections of elements from a subbase form a topology

score 66 · Answer 13 · 2026-04-10 14:32:30

66

Views

A question about topology.

Published on 10 Apr 2026 - 14:32

score 887 · Answer 14 · 2026-04-12 06:04:24

887

Views

On closure of products being product of closures, for the product and box topology [Proof Verification]

Published on 12 Apr 2026 - 6:04

score 477 · Answer 15 · 2026-04-10 06:28:13

477

Views

How to show a topological space is not metrizable?

Published on 10 Apr 2026 - 6:28

List Question

Confusion between finite set and countable set?

Sheaf on a point space is always the skyscaper sheaf

Find the supremeum and infimum, and is the set compact?

There exists a countable collection of sets $E_i$ with open union such that $\text{diam }E_i<\epsilon$ and $A \subset \bigcup E_i$

If $B$ is a subbasis for $T$, $B'$ for $T'$, $C:= B \times B'$ is closed under intersections

Can the topology generated from the lexicographic order on $\mathbb{R}^2$ come from a metric?

The sum of a completely continuous function with a contraction is a condensing function?

Proving two outer measures defined on the unit circle $C$ are the same measure.

Is every set metrisable?

Showing the limit points of E are equal to the limit points of E closure.

How to use Lebesgue number lemma?

Satisfying the union of open sets axiom to prove unions of finite intersections of elements from a subbase form a topology

A question about topology.

On closure of products being product of closures, for the product and box topology [Proof Verification]

How to show a topological space is not metrizable?

Trending Questions

Popular # Hahtags

Popular Questions