Question

Cantor-Bernstein-Schröder Theorem: small proof using Graph Theory, is this correct?

score 1k · Answer 1 · 2026-04-08 23:08:57

1k

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Cantor-Bernstein-Schröder Theorem: small proof using Graph Theory, is this correct?

Published on 08 Apr 2026 - 23:08

score 591 · Answer 2 · 2026-04-10 10:46:41

591

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Forcing homeomorphism

Published on 10 Apr 2026 - 10:46

score 292 · Answer 3 · 2026-04-08 23:10:57

292

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A proof of the simple pressing down lemma, is sup $x=x?$

Published on 08 Apr 2026 - 23:10

score 266 · Answer 4 · 2026-04-13 14:41:39

266

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Is the set of cardinalities totally ordered?

Published on 13 Apr 2026 - 14:41

score 88 · Answer 5 · 2026-04-11 12:38:50

88

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Show that $n+\aleph_0=\aleph_0$

Published on 11 Apr 2026 - 12:38

score 135 · Answer 6 · 2026-04-08 23:08:32

135

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$COF(\lambda)$ is stationary in $k$, where $\lambda < k$ is regular.

Published on 08 Apr 2026 - 23:08

score 61 · Answer 7 · 2026-04-11 03:28:04

61

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Completion of incomplete claim about General Set Theory (GST) in Wiki article

Published on 11 Apr 2026 - 3:28

score 322 · Answer 8 · 2026-04-13 05:48:17

322

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Strength of $\sf ZF$+The weak topology on every Banach space is Hausdorff

Published on 13 Apr 2026 - 5:48

score 129 · Answer 9 · 2026-04-10 20:12:53

$\{A_\alpha:\alpha<\omega_1\}$ Prove that there exist stationary $S\subseteq\omega_1$ such that $\{A_\alpha:\alpha\in S\}$ is $\Delta$-system.

score 285 · Answer 10 · 2026-04-14 15:04:33

285

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Maximum subset of $\mathbb{R}$ with a special property

Published on 14 Apr 2026 - 15:04

score 580 · Answer 11 · 2026-04-13 01:07:22

580

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Difficulty in understanding cantor normal form

Published on 13 Apr 2026 - 1:07

score 187 · Answer 12 · 2026-04-08 23:12:01

187

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What are $L_1$ and $L_2$ in the Gödel Constructible Hierarchy

Published on 08 Apr 2026 - 23:12

score 296 · Answer 13 · 2026-04-09 03:13:21

Given a decreasing family of sets and partitions with a refinement condition, is there a monotonous choice function from the partitions?

score 318 · Answer 14 · 2026-04-10 03:12:54

318

Views

Is there an uncountable family of infinite parts of $\mathbb N$ with two to two intersection finite?

Published on 10 Apr 2026 - 3:12

score 81 · Answer 15 · 2026-04-09 02:00:52

81

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Question about the proof of Lemma 14.19 (Maximum Principle) in Jech's Set Theory

Published on 09 Apr 2026 - 2:00

List Question

Cantor-Bernstein-Schröder Theorem: small proof using Graph Theory, is this correct?

Forcing homeomorphism

A proof of the simple pressing down lemma, is sup $x=x?$

Is the set of cardinalities totally ordered?

Show that $n+\aleph_0=\aleph_0$

$COF(\lambda)$ is stationary in $k$, where $\lambda < k$ is regular.

Completion of incomplete claim about General Set Theory (GST) in Wiki article

Strength of $\sf ZF$+The weak topology on every Banach space is Hausdorff

$\{A_\alpha:\alpha<\omega_1\}$ Prove that there exist stationary $S\subseteq\omega_1$ such that $\{A_\alpha:\alpha\in S\}$ is $\Delta$-system.

Maximum subset of $\mathbb{R}$ with a special property

Difficulty in understanding cantor normal form

What are $L_1$ and $L_2$ in the Gödel Constructible Hierarchy

Given a decreasing family of sets and partitions with a refinement condition, is there a monotonous choice function from the partitions?

Is there an uncountable family of infinite parts of $\mathbb N$ with two to two intersection finite?

Question about the proof of Lemma 14.19 (Maximum Principle) in Jech's Set Theory

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