Question

How to show that $\omega+\omega_1=\omega_1$?

score 71 · Answer 1 · 2021-09-29 16:01:50

71

Views

How to show that $\omega+\omega_1=\omega_1$?

Published on 29 Sep 2021 - 16:01

score 224 · Answer 2 · 2021-10-03 01:14:01

224

Views

Is $\Gamma(\alpha,\alpha)\le \alpha^2$ where $\Gamma$ is the Gödel paring function?

Published on 03 Oct 2021 - 1:14

score 116 · Answer 3 · 2021-10-04 11:48:55

116

Views

Why does it hold that $\delta \underline{W(\omega_1)} = \aleph_1?$

Published on 04 Oct 2021 - 11:48

score 161 · Answer 4 · 2021-10-06 12:52:53

161

Views

$|X| \le |Y|$ iff there is a injection from $X$ to $Y$

Published on 06 Oct 2021 - 12:52

score 436 · Answer 5 · 2021-10-11 20:02:16

436

Views

Prove $\text{cf}(\aleph_{\omega}) = \text{cf}(\aleph_{\omega + \omega}) = \omega$ and $\text{cf}(\aleph_{\omega_{1}}) = \omega_{1}$.

Published on 11 Oct 2021 - 20:02

score 149 · Answer 6 · 2021-10-12 05:57:38

149

Views

How to compare two particular ordinals?

Published on 12 Oct 2021 - 5:57

score 199 · Answer 7 · 2026-03-30 05:28:47

199

Views

Ordinals in $L$, the constructible universe

Published on 30 Mar 2026 - 5:28

score 34 · Answer 8 · 2026-02-23 13:29:28

34

Views

Where do winning strategies occur for Player II in the Determinacy of Computable Open Games relative to a parameter?

Published on 23 Feb 2026 - 13:29

score 67 · Answer 9 · 2021-10-27 08:57:57

67

Views

How to form a set of all ordinals up to e.g. $\omega_0$?

Published on 27 Oct 2021 - 8:57

score 148 · Answer 10 · 2021-10-28 12:29:49

148

Views

Idempotent law of cardinal arithmetic

Published on 28 Oct 2021 - 12:29

score 109 · Answer 11 · 2021-11-04 16:40:38

109

Views

Categorical Characterization of Ordinal Products/Exponentiation

Published on 04 Nov 2021 - 16:40

score 69 · Answer 12 · 2021-11-07 21:41:54

69

Views

What is hom-set of small ordinal numbers?

Published on 07 Nov 2021 - 21:41

score 80 · Answer 13 · 2021-11-12 12:25:47

80

Views

Notation for the predecessor of an ordinal

Published on 12 Nov 2021 - 12:25

score 100 · Answer 14 · 2021-11-12 20:09:55

100

Views

Finding a winning strategy for a game in ZF + “$\omega_1$ is regular”.

Published on 12 Nov 2021 - 20:09

score 72 · Answer 15 · 2026-03-28 09:54:23

72

Views

Is $\mathbb{N} $ order isomorphic with $\mathbb{N} \cup \{\infty\}$?

Published on 28 Mar 2026 - 9:54

List Question

How to show that $\omega+\omega_1=\omega_1$?

Is $\Gamma(\alpha,\alpha)\le \alpha^2$ where $\Gamma$ is the Gödel paring function?

Why does it hold that $\delta \underline{W(\omega_1)} = \aleph_1?$

$|X| \le |Y|$ iff there is a injection from $X$ to $Y$

Prove $\text{cf}(\aleph_{\omega}) = \text{cf}(\aleph_{\omega + \omega}) = \omega$ and $\text{cf}(\aleph_{\omega_{1}}) = \omega_{1}$.

How to compare two particular ordinals?

Ordinals in $L$, the constructible universe

Where do winning strategies occur for Player II in the Determinacy of Computable Open Games relative to a parameter?

How to form a set of all ordinals up to e.g. $\omega_0$?

Idempotent law of cardinal arithmetic

Categorical Characterization of Ordinal Products/Exponentiation

What is hom-set of small ordinal numbers?

Notation for the predecessor of an ordinal

Finding a winning strategy for a game in ZF + “$\omega_1$ is regular”.

Is $\mathbb{N} $ order isomorphic with $\mathbb{N} \cup \{\infty\}$?

Trending Questions

Popular # Hahtags

Popular Questions