Question

Sketch the sets in $\mathbb C$ and determine whether they are open, closed, or neither; bounded; connected and their boundaries.

score 1.1k · Answer 1 · 2026-03-28 22:28:02

1.1k

Views

Sketch the sets in $\mathbb C$ and determine whether they are open, closed, or neither; bounded; connected and their boundaries.

Published on 28 Mar 2026 - 22:28

score 46 · Answer 2 · 2026-03-25 19:11:12

46

Views

An $n \times n$ matrix $A$ naturally induces a mapping on $Grass(p,n)$

Published on 25 Mar 2026 - 19:11

score 307 · Answer 3 · 2026-04-03 12:34:09

307

Views

Real-valued function $f : \mathbb{R} \to \overline{\mathbb{R}}$ is continuous iff its graph is closed

Published on 03 Apr 2026 - 12:34

score 1.2k · Answer 4 · 2018-07-30 14:49:31

1.2k

Views

Find the interior and boundary of a set.

Published on 30 Jul 2018 - 14:49

score 90 · Answer 5 · 2026-04-09 02:43:35

90

Views

quasi-uniformisation of bitopological spaces

Published on 09 Apr 2026 - 2:43

score 517 · Answer 6 · 2026-04-02 02:04:14

517

Views

Showing the diagonal on $\mathbb{R}^2$ is closed

Published on 02 Apr 2026 - 2:04

score 192 · Answer 7 · 2026-03-29 16:28:12

192

Views

Is a converging net + limit always compact?

Published on 29 Mar 2026 - 16:28

score 570 · Answer 8 · 2026-04-11 13:50:59

570

Views

Connecting points in an annulus with horizontal and vertical segments

Published on 11 Apr 2026 - 13:50

score 397 · Answer 9 · 2026-03-25 20:36:17

397

Views

One-point compactification of disjoint union is homeomorphic to wedge sum of one-point compactifications

Published on 25 Mar 2026 - 20:36

score 36 · Answer 10 · 2026-04-02 02:00:22

36

Views

Help constructing a continuous function to prove whether a set is open or closed

Published on 02 Apr 2026 - 2:00

score 88 · Answer 11 · 2026-03-30 02:06:47

88

Views

The meaning of $\Bbb R^\Bbb N$

Published on 30 Mar 2026 - 2:06

score 93 · Answer 12 · 2026-04-02 02:04:14

93

Views

trying to prove this set is open/closed

Published on 02 Apr 2026 - 2:04

score 690 · Answer 13 · 2026-04-10 22:49:04

690

Views

Quotient of $[-1,1]$ homeomorphic to unit circle

Published on 10 Apr 2026 - 22:49

score 67 · Answer 14 · 2026-03-25 07:44:55

67

Views

mapping degree of $f: X \rightarrow Y$ with $\dim X \neq \dim Y$

Published on 25 Mar 2026 - 7:44

score 51 · Answer 15 · 2026-04-11 19:31:07

51

Views

Can $\Bbb Z[\frac16]/{\sim}$ inherit the topology from the 2-adic integers $\Bbb Z_2$?

Published on 11 Apr 2026 - 19:31

List Question

Sketch the sets in $\mathbb C$ and determine whether they are open, closed, or neither; bounded; connected and their boundaries.

An $n \times n$ matrix $A$ naturally induces a mapping on $Grass(p,n)$

Real-valued function $f : \mathbb{R} \to \overline{\mathbb{R}}$ is continuous iff its graph is closed

Find the interior and boundary of a set.

quasi-uniformisation of bitopological spaces

Showing the diagonal on $\mathbb{R}^2$ is closed

Is a converging net + limit always compact?

Connecting points in an annulus with horizontal and vertical segments

One-point compactification of disjoint union is homeomorphic to wedge sum of one-point compactifications

Help constructing a continuous function to prove whether a set is open or closed

The meaning of $\Bbb R^\Bbb N$

trying to prove this set is open/closed

Quotient of $[-1,1]$ homeomorphic to unit circle

mapping degree of $f: X \rightarrow Y$ with $\dim X \neq \dim Y$

Can $\Bbb Z[\frac16]/{\sim}$ inherit the topology from the 2-adic integers $\Bbb Z_2$?

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