Question

Attempt to define limit of a sequence of surreal numbers

score 305 · Answer 1 · 2026-03-25 16:14:07

305

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Attempt to define limit of a sequence of surreal numbers

Published on 25 Mar 2026 - 16:14

score 134 · Answer 2 · 2020-10-30 01:00:54

134

Views

Arbitrarily large sized gaps in the $L$ hierarchy

Published on 30 Oct 2020 - 1:00

score 251 · Answer 3 · 2020-11-06 03:09:51

251

Views

ordinal spaces and order topology

Published on 06 Nov 2020 - 3:09

score 30 · Answer 4 · 2020-11-09 18:16:10

30

Views

Can ZF prove the cartesian product of an ordinal by itself to be subnumerous to that ordinal?

Published on 09 Nov 2020 - 18:16

score 68 · Answer 5 · 2020-11-09 18:43:08

68

Views

Can $\omega_2$ be the order type of a countable union of countable sets of ordinals?

Published on 09 Nov 2020 - 18:43

score 57 · Answer 6 · 2020-11-12 06:27:31

57

Views

Choosing aleph with given property

Published on 12 Nov 2020 - 6:27

score 113 · Answer 7 · 2020-11-12 18:43:52

113

Views

Injection of ordinal $\alpha$ into $\beta$ means $\alpha \subseteq \beta$

Published on 12 Nov 2020 - 18:43

score 130 · Answer 8 · 2020-11-13 13:07:15

130

Views

Simple proof showing a subset has smaller cardinal

Published on 13 Nov 2020 - 13:07

score 129 · Answer 9 · 2020-11-13 18:16:36

129

Views

Prove $\alpha \leq \beta \Rightarrow \alpha^{\gamma} \leq \beta^{\gamma}$

Published on 13 Nov 2020 - 18:16

score 399 · Answer 10 · 2026-04-05 16:09:20

399

Views

Extensions of the Turing jump

Published on 05 Apr 2026 - 16:09

score 93 · Answer 11 · 2020-11-16 13:40:47

93

Views

Does this work to prove that uncountable ordinals exists?

Published on 16 Nov 2020 - 13:40

score 77 · Answer 12 · 2020-11-16 15:00:31

77

Views

Show that $3+\omega^2\not=\omega^2+3$ where $\omega$ denotes the least infinite ordinal

Published on 16 Nov 2020 - 15:00

score 81 · Answer 13 · 2020-11-17 19:15:12

81

Views

A proof that $\omega^\alpha$ is countable for every countable ordinal $\alpha$?

Published on 17 Nov 2020 - 19:15

score 47 · Answer 14 · 2020-11-18 06:28:02

47

Views

Increasing subsequence with given limit

Published on 18 Nov 2020 - 6:28

score 107 · Answer 15 · 2020-11-20 21:40:47

107

Views

Are all ordinals higher than $ω$ epsilon numbers?

Published on 20 Nov 2020 - 21:40

List Question

Attempt to define limit of a sequence of surreal numbers

Arbitrarily large sized gaps in the $L$ hierarchy

ordinal spaces and order topology

Can ZF prove the cartesian product of an ordinal by itself to be subnumerous to that ordinal?

Can $\omega_2$ be the order type of a countable union of countable sets of ordinals?

Choosing aleph with given property

Injection of ordinal $\alpha$ into $\beta$ means $\alpha \subseteq \beta$

Simple proof showing a subset has smaller cardinal

Prove $\alpha \leq \beta \Rightarrow \alpha^{\gamma} \leq \beta^{\gamma}$

Extensions of the Turing jump

Does this work to prove that uncountable ordinals exists?

Show that $3+\omega^2\not=\omega^2+3$ where $\omega$ denotes the least infinite ordinal

A proof that $\omega^\alpha$ is countable for every countable ordinal $\alpha$?

Increasing subsequence with given limit

Are all ordinals higher than $ω$ epsilon numbers?

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