Question

Beth sequence, initial ordinals and fixed point

score 94 · Answer 1 · 2023-05-18 18:17:06

94

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Beth sequence, initial ordinals and fixed point

Published on 18 May 2023 - 18:17

score 31 · Answer 2 · 2026-03-26 21:09:30

31

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A class of linear orderings with a convexity property on ordinals

Published on 26 Mar 2026 - 21:09

score 91 · Answer 3 · 2026-03-26 21:09:31

91

Views

What are the order types of computable pseudo-ordinals with no c.e. descending chains?

Published on 26 Mar 2026 - 21:09

score 73 · Answer 4 · 2026-03-26 19:18:56

73

Views

Is the rank of a tree a natural number or $\omega$?

Published on 26 Mar 2026 - 19:18

score 58 · Answer 5 · 2023-06-08 16:19:53

58

Views

Help understanding existence proof for the set of countable ordinals?

Published on 08 Jun 2023 - 16:19

score 129 · Answer 6 · 2023-06-10 05:57:40

129

Views

Classification of compact Hausdorff spaces $X$ of cardinality $2^{\aleph_0}>|X|\geq \aleph_1$?

Published on 10 Jun 2023 - 5:57

score 255 · Answer 7 · 2026-03-25 03:07:17

255

Views

What, precisely, does it mean to represent an ordinal on a computer?

Published on 25 Mar 2026 - 3:07

score 130 · Answer 8 · 2023-06-25 12:26:13

130

Views

Why is $\epsilon_0$ a fixed point? Why don't/can't we define tetration of $\omega$ beyond $\omega$?

Published on 25 Jun 2023 - 12:26

score 112 · Answer 9 · 2023-06-25 20:52:20

112

Views

Ordinal arithmetic $\omega^2 + \omega^3 = \omega^2 + \omega^2$

Published on 25 Jun 2023 - 20:52

score 162 · Answer 10 · 2023-06-28 10:42:11

162

Views

The intersection of a class of ordinals belongs to the class

Published on 28 Jun 2023 - 10:42

score 81 · Answer 11 · 2026-03-25 09:24:19

81

Views

How to prove this alternative version of transfinite recursion

Published on 25 Mar 2026 - 9:24

score 91 · Answer 12 · 2023-07-06 22:58:09

91

Views

Non-isomorphic well-orderings on a set

Published on 06 Jul 2023 - 22:58

score 268 · Answer 13 · 2026-03-25 03:04:16

268

Views

What is the least upper bound ordinal of my linear n-symbol partition ordinal (ordinal that contain all finite string of finite different symbol)?

Published on 25 Mar 2026 - 3:04

score 80 · Answer 14 · 2023-07-10 09:13:15

80

Views

Proving directly that $\aleph_{\alpha+1} \cdot \aleph_{\alpha+1} = \aleph_{\alpha+1}$ by recursion

Published on 10 Jul 2023 - 9:13

score 192 · Answer 15 · 2026-03-26 21:09:30

192

Views

Which countable ordinals are common to every $\omega$-model of ZF?

Published on 26 Mar 2026 - 21:09

List Question

Beth sequence, initial ordinals and fixed point

A class of linear orderings with a convexity property on ordinals

What are the order types of computable pseudo-ordinals with no c.e. descending chains?

Is the rank of a tree a natural number or $\omega$?

Help understanding existence proof for the set of countable ordinals?

Classification of compact Hausdorff spaces $X$ of cardinality $2^{\aleph_0}>|X|\geq \aleph_1$?

What, precisely, does it mean to represent an ordinal on a computer?

Why is $\epsilon_0$ a fixed point? Why don't/can't we define tetration of $\omega$ beyond $\omega$?

Ordinal arithmetic $\omega^2 + \omega^3 = \omega^2 + \omega^2$

The intersection of a class of ordinals belongs to the class

How to prove this alternative version of transfinite recursion

Non-isomorphic well-orderings on a set

What is the least upper bound ordinal of my linear n-symbol partition ordinal (ordinal that contain all finite string of finite different symbol)?

Proving directly that $\aleph_{\alpha+1} \cdot \aleph_{\alpha+1} = \aleph_{\alpha+1}$ by recursion

Which countable ordinals are common to every $\omega$-model of ZF?

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