Question

(Covering space) Does Deck move whole sheets in whole sheets?

score 105 · Answer 1 · 2026-04-11 18:34:36

105

Views

(Covering space) Does Deck move whole sheets in whole sheets?

Published on 11 Apr 2026 - 18:34

score 92 · Answer 2 · 2026-04-12 10:23:46

92

Views

Preimage of $\partial\Omega$ under a continuous function

Published on 12 Apr 2026 - 10:23

score 183 · Answer 3 · 2026-05-11 03:24:52

183

Views

T shaped tetris figures on a plane

Published on 11 May 2026 - 3:24

score 217 · Answer 4 · 2026-04-11 13:52:47

217

Views

How does the definition of an open ball in a metric space exclude the empty set?

Published on 11 Apr 2026 - 13:52

score 149 · Answer 5 · 2026-04-14 08:07:21

149

Views

Is this a typo about the derived set in textbook Introduction to Set Theory by Hrbacek and Jech?

Published on 14 Apr 2026 - 8:07

score 102 · Answer 6 · 2026-04-12 20:49:33

102

Views

Surjections between homology groups

Published on 12 Apr 2026 - 20:49

score 291 · Answer 7 · 2026-04-15 12:29:54

291

Views

Surjective functions from a $n$-dimensional hypercube to $\mathbb{R}^m$ when $n > m$

Published on 15 Apr 2026 - 12:29

score 1.4k · Answer 8 · 2026-04-17 15:46:00

1.4k

Views

Let $f:X\to X $ be continuous. Does $f $ have a fixed point when $X=[0,1)$ or $X=(0,1) $?

Published on 17 Apr 2026 - 15:46

score 204 · Answer 9 · 2026-04-14 23:41:29

204

Views

Dictionary order topology based query

Published on 14 Apr 2026 - 23:41

score 247 · Answer 10 · 2026-05-11 04:42:07

If $\gamma\colon[a,b]\to\mathbb{C}$ is continuous and $\gamma(b)=-\gamma(a)$, must the curves $\gamma$ and $e^{ic}\gamma$ intersect for all real $c$?

score 426 · Answer 11 · 2026-04-12 00:48:29

426

Views

Punctured open set is not contractible

Published on 12 Apr 2026 - 0:48

score 685 · Answer 12 · 2026-04-12 03:08:26

685

Views

What can we say about two topological spaces with the same fundamental group?

Published on 12 Apr 2026 - 3:08

score 87 · Answer 13 · 2026-04-16 12:41:40

87

Views

Help proving this map is closed

Published on 16 Apr 2026 - 12:41

score 566 · Answer 14 · 2026-04-14 14:09:38

566

Views

$x \neq y\in$ metric space $M$, prove $\exists$ open sets $U,V$ s.t. $x\in U,\ y\in V$ and $\bar{U} \cap \bar{V} = \emptyset$

Published on 14 Apr 2026 - 14:09

score 150 · Answer 15 · 2026-03-27 21:20:30

150

Views

Show that $K∩L$ is homeomorphic to $A$, where $K ∩ L = \{\{(a,0),(a,1)\} : a \in A\}$ is a subset of equivalence classes in $[0,1] \times \{0,1\}$.

Published on 27 Mar 2026 - 21:20

List Question

(Covering space) Does Deck move whole sheets in whole sheets?

Preimage of $\partial\Omega$ under a continuous function

T shaped tetris figures on a plane

How does the definition of an open ball in a metric space exclude the empty set?

Is this a typo about the derived set in textbook Introduction to Set Theory by Hrbacek and Jech?

Surjections between homology groups

Surjective functions from a $n$-dimensional hypercube to $\mathbb{R}^m$ when $n > m$

Let $f:X\to X $ be continuous. Does $f $ have a fixed point when $X=[0,1)$ or $X=(0,1) $?

Dictionary order topology based query

If $\gamma\colon[a,b]\to\mathbb{C}$ is continuous and $\gamma(b)=-\gamma(a)$, must the curves $\gamma$ and $e^{ic}\gamma$ intersect for all real $c$?

Punctured open set is not contractible

What can we say about two topological spaces with the same fundamental group?

Help proving this map is closed

$x \neq y\in$ metric space $M$, prove $\exists$ open sets $U,V$ s.t. $x\in U,\ y\in V$ and $\bar{U} \cap \bar{V} = \emptyset$

Show that $K∩L$ is homeomorphic to $A$, where $K ∩ L = \{\{(a,0),(a,1)\} : a \in A\}$ is a subset of equivalence classes in $[0,1] \times \{0,1\}$.

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