Question

Why are there continuum many nowhere dense subsets of $\mathbb R$?

score 183 · Answer 1 · 2026-04-15 03:53:09

183

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Why are there continuum many nowhere dense subsets of $\mathbb R$?

Published on 15 Apr 2026 - 3:53

score 60 · Answer 2 · 2026-04-11 02:45:18

60

Views

Is $F ↾ a$ a set?

Published on 11 Apr 2026 - 2:45

score 140 · Answer 3 · 2026-04-12 06:16:32

140

Views

Löwenheim-Skolem and proper class models of ZFC.

Published on 12 Apr 2026 - 6:16

score 416 · Answer 4 · 2026-04-09 01:49:44

416

Views

Is $\omega + \omega^2 = \omega^2$ true?

Published on 09 Apr 2026 - 1:49

score 226 · Answer 5 · 2026-04-24 00:33:50

226

Views

Could there be an $\omega_1^{CK}$th hyperoperation?

Published on 24 Apr 2026 - 0:33

score 193 · Answer 6 · 2026-04-15 18:29:46

193

Views

ZF(C): Model or Inner Model

Published on 15 Apr 2026 - 18:29

score 193 · Answer 7 · 2026-04-09 07:15:48

193

Views

Understanding the proof of $V=L \rightarrow \Diamond$

Published on 09 Apr 2026 - 7:15

score 417 · Answer 8 · 2026-04-14 14:25:47

417

Views

Ex.1.7 Jech "Set Theory". (The shortest proof)

Published on 14 Apr 2026 - 14:25

score 289 · Answer 9 · 2026-04-12 08:48:20

289

Views

Bijection between collection C and proper class PC makes C a proper class?

Published on 12 Apr 2026 - 8:48

score 87 · Answer 10 · 2026-04-12 20:28:08

87

Views

Set-theoretic worries about functor transformation from $\text{Id}$ to $V\mapsto V^*$

Published on 12 Apr 2026 - 20:28

score 63 · Answer 11 · 2026-04-14 12:21:12

63

Views

Choicelike consequence of compactness

Published on 14 Apr 2026 - 12:21

score 113 · Answer 12 · 2026-04-15 15:55:36

113

Views

Class Absoluteness on $V$ with ZF-Models

Published on 15 Apr 2026 - 15:55

score 126 · Answer 13 · 2026-04-13 21:37:33

126

Views

Cardinality of an uncountable union of countably infinite sets?

Published on 13 Apr 2026 - 21:37

score 229 · Answer 14 · 2026-04-14 13:46:12

229

Views

Proving Hausdorff maximality principle without Choice

Published on 14 Apr 2026 - 13:46

score 129 · Answer 15 · 2026-04-14 00:23:39

129

Views

Proof of MM implies non-stationary ideal on $\aleph_1$ is $\aleph_2$ saturated.

Published on 14 Apr 2026 - 0:23

List Question

Why are there continuum many nowhere dense subsets of $\mathbb R$?

Is $F ↾ a$ a set?

Löwenheim-Skolem and proper class models of ZFC.

Is $\omega + \omega^2 = \omega^2$ true?

Could there be an $\omega_1^{CK}$th hyperoperation?

ZF(C): Model or Inner Model

Understanding the proof of $V=L \rightarrow \Diamond$

Ex.1.7 Jech "Set Theory". (The shortest proof)

Bijection between collection C and proper class PC makes C a proper class?

Set-theoretic worries about functor transformation from $\text{Id}$ to $V\mapsto V^*$

Choicelike consequence of compactness

Class Absoluteness on $V$ with ZF-Models

Cardinality of an uncountable union of countably infinite sets?

Proving Hausdorff maximality principle without Choice

Proof of MM implies non-stationary ideal on $\aleph_1$ is $\aleph_2$ saturated.

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