Question

What does a hyperreal version of the Cantor Set look like?

score 168 · Answer 1 · 2026-05-10 12:10:59

168

Views

What does a hyperreal version of the Cantor Set look like?

Published on 10 May 2026 - 12:10

score 216 · Answer 2 · 2026-04-12 06:08:01

216

Views

Sets definable by $\Sigma_2$ parameters

Published on 12 Apr 2026 - 6:08

score 171 · Answer 3 · 2026-04-30 14:55:25

171

Views

Simple ordinal question

Published on 30 Apr 2026 - 14:55

score 130 · Answer 4 · 2026-05-10 11:17:22

130

Views

How exactly does the oracle for a well-order of order type $\omega_1^\text{CK}$ operate?

Published on 10 May 2026 - 11:17

score 311 · Answer 5 · 2026-04-17 09:28:38

Is it possible to base the slow-growing hierarchy on the ordinal defined as “the height of the minimal model of ZFC (assuming it exists)”?

score 43 · Answer 6 · 2026-04-16 01:53:39

43

Views

Does $\{x \in \mathcal X:x>a \land x<b+1 \}$ give $(a,b+1)$ or $(a,b]$?

Published on 16 Apr 2026 - 1:53

score 151 · Answer 7 · 2026-04-15 00:45:15

151

Views

Proper initial segment $X$ of a von Neumann ordinal $Y$ has different order-isomorphism class from $Y$

Published on 15 Apr 2026 - 0:45

score 40 · Answer 8 · 2026-05-10 17:16:23

40

Views

A variant of the definition of an ordinal number

Published on 10 May 2026 - 17:16

score 331 · Answer 9 · 2026-05-10 13:59:08

331

Views

Applying transfinite recursion

Published on 10 May 2026 - 13:59

score 208 · Answer 10 · 2026-04-16 08:50:13

208

Views

Proving that if $\kappa$ is a limit ordinal, then $\alpha+\kappa=\bigcup_{\gamma\in\kappa}\left(\alpha+\gamma\right)$

Published on 16 Apr 2026 - 8:50

score 81 · Answer 11 · 2026-04-14 04:53:17

81

Views

Function with an ordinal domain: an ambiguity between a notation for a value and for an image

Published on 14 Apr 2026 - 4:53

score 210 · Answer 12 · 2026-04-17 12:43:16

210

Views

Why can the set of all natural numbers and omega be put in one-to-one correspondence with natural numbers?

Published on 17 Apr 2026 - 12:43

score 92 · Answer 13 · 2026-04-09 19:22:03

92

Views

A cofinal function into a limit ordinal

Published on 09 Apr 2026 - 19:22

score 54 · Answer 14 · 2026-04-09 07:01:53

54

Views

Understanding a proof about regular cardinals from "Set Theory for the Working Mathematician"

Published on 09 Apr 2026 - 7:01

score 205 · Answer 15 · 2026-05-10 18:28:49

205

Views

Does there exist a strict numeric measure of the strength for any set theory (relative to a corresponding proof-theoretic ordinal)?

Published on 10 May 2026 - 18:28

List Question

What does a hyperreal version of the Cantor Set look like?

Sets definable by $\Sigma_2$ parameters

Simple ordinal question

How exactly does the oracle for a well-order of order type $\omega_1^\text{CK}$ operate?

Is it possible to base the slow-growing hierarchy on the ordinal defined as “the height of the minimal model of ZFC (assuming it exists)”?

Does $\{x \in \mathcal X:x>a \land x<b+1 \}$ give $(a,b+1)$ or $(a,b]$?

Proper initial segment $X$ of a von Neumann ordinal $Y$ has different order-isomorphism class from $Y$

A variant of the definition of an ordinal number

Applying transfinite recursion

Proving that if $\kappa$ is a limit ordinal, then $\alpha+\kappa=\bigcup_{\gamma\in\kappa}\left(\alpha+\gamma\right)$

Function with an ordinal domain: an ambiguity between a notation for a value and for an image

Why can the set of all natural numbers and omega be put in one-to-one correspondence with natural numbers?

A cofinal function into a limit ordinal

Understanding a proof about regular cardinals from "Set Theory for the Working Mathematician"

Does there exist a strict numeric measure of the strength for any set theory (relative to a corresponding proof-theoretic ordinal)?

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