Question

On Kelley's _General Topology_ Set Theory

score 125 · Answer 1 · 2026-04-15 03:57:13

125

Views

On Kelley's _General Topology_ Set Theory

Published on 15 Apr 2026 - 3:57

score 109 · Answer 2 · 2026-04-08 22:28:24

109

Views

Possibility of preserving the ultrafilter on $\mathcal{P}_{\kappa}(\lambda)$ in V[G] after forcing with a <$\kappa$ directed closed poset?

Published on 08 Apr 2026 - 22:28

score 110 · Answer 3 · 2026-04-13 23:41:05

110

Views

Lusin theorem and axiom of choice

Published on 13 Apr 2026 - 23:41

score 106 · Answer 4 · 2026-04-14 20:50:46

106

Views

A set S such that $S \subset S^{S}$

Published on 14 Apr 2026 - 20:50

score 173 · Answer 5 · 2026-04-12 11:41:49

173

Views

Proof of the Kuratowski Formalization

Published on 12 Apr 2026 - 11:41

score 287 · Answer 6 · 2026-04-12 05:18:43

287

Views

Embedding $\aleph_1$ into $\mathbb R$

Published on 12 Apr 2026 - 5:18

score 655 · Answer 7 · 2026-04-12 23:44:40

655

Views

For any countable ordinal $\alpha$, there is some closed set of reals whose Cantor-Bendixson rank is $\alpha$

Published on 12 Apr 2026 - 23:44

score 100 · Answer 8 · 2026-04-16 04:33:30

100

Views

Axiom Schema of Separation in ZF and phrasing Russel's Property

Published on 16 Apr 2026 - 4:33

score 150 · Answer 9 · 2026-04-09 02:01:33

150

Views

Cardinality of powers of infinite sets

Published on 09 Apr 2026 - 2:01

score 749 · Answer 10 · 2026-04-08 22:59:04

749

Views

A,B Sets injective map A into B or bijection subset A onto B

Published on 08 Apr 2026 - 22:59

score 457 · Answer 11 · 2026-04-06 07:39:45

457

Views

The successor of an ordinal is also an ordinal

Published on 06 Apr 2026 - 7:39

score 524 · Answer 12 · 2026-04-04 17:48:16

524

Views

Some question regarding the proof of Cantor normal form.

Published on 04 Apr 2026 - 17:48

score 177 · Answer 13 · 2026-04-08 22:07:55

177

Views

Understanding Absoluteness

Published on 08 Apr 2026 - 22:07

score 85 · Answer 14 · 2026-04-11 14:44:02

85

Views

Is it possible to have cofinal and coinitial sets indexed by the same ordinal?

Published on 11 Apr 2026 - 14:44

score 232 · Answer 15 · 2026-04-10 07:39:31

232

Views

Can every uncountable cardinal be realized as a cofinality?

Published on 10 Apr 2026 - 7:39

List Question

On Kelley's _General Topology_ Set Theory

Possibility of preserving the ultrafilter on $\mathcal{P}_{\kappa}(\lambda)$ in V[G] after forcing with a <$\kappa$ directed closed poset?

Lusin theorem and axiom of choice

A set S such that $S \subset S^{S}$

Proof of the Kuratowski Formalization

Embedding $\aleph_1$ into $\mathbb R$

For any countable ordinal $\alpha$, there is some closed set of reals whose Cantor-Bendixson rank is $\alpha$

Axiom Schema of Separation in ZF and phrasing Russel's Property

Cardinality of powers of infinite sets

A,B Sets injective map A into B or bijection subset A onto B

The successor of an ordinal is also an ordinal

Some question regarding the proof of Cantor normal form.

Understanding Absoluteness

Is it possible to have cofinal and coinitial sets indexed by the same ordinal?

Can every uncountable cardinal be realized as a cofinality?

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