List questions from ordinals

Published on 25 Feb 2011 - 7:05

168

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Transfinite sequences of topologies

Published on 07 Mar 2011 - 17:17

3k

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A transitive set of ordinals is an ordinal

Published on 24 Mar 2011 - 23:55

1.4k

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Can any infinite ordinal be expressed as the sum of a limit ordinal and a finite ordinal?

Published on 21 Apr 2011 - 19:48

684

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Is $V$ under ZFC really a proper class?

Published on 22 Apr 2011 - 21:10

195

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Small question on proof that any ordinal is the index of some initial ordinal

Published on 04 May 2011 - 5:18

486

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If $\kappa<\aleph_\alpha$, then $\kappa\leq\alpha$?

Published on 07 May 2011 - 2:14

636

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Equivalent definitions of ordinals?

Published on 08 May 2011 - 1:36

258

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Computable increasing function from $\omega_1^{CK} \to \mathbb{R}$

Published on 27 Mar 2026 - 19:40

3.5k

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Countable compact spaces as ordinals

Published on 29 Mar 2026 - 3:21

693

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How do you find the smallest of homeomorphic ordinals?

Published on 28 Mar 2026 - 23:59

259

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Sequence of surjections imply choice

Published on 23 May 2011 - 14:49

2.2k

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Simple (even toy) examples for uses of Ordinals?

Published on 24 May 2011 - 7:01

1.6k

Views

Derived sets and ordinals

Published on 29 Mar 2026 - 3:21

154

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Simplify $2^{\omega_1}$

Published on 31 May 2011 - 14:58

List Question

Proving $0$ is an ordinal

Transfinite sequences of topologies

A transitive set of ordinals is an ordinal

Can any infinite ordinal be expressed as the sum of a limit ordinal and a finite ordinal?

Is $V$ under ZFC really a proper class?

Small question on proof that any ordinal is the index of some initial ordinal

If $\kappa<\aleph_\alpha$, then $\kappa\leq\alpha$?

Equivalent definitions of ordinals?

Computable increasing function from $\omega_1^{CK} \to \mathbb{R}$

Countable compact spaces as ordinals

How do you find the smallest of homeomorphic ordinals?

Sequence of surjections imply choice

Simple (even toy) examples for uses of Ordinals?

Derived sets and ordinals

Simplify $2^{\omega_1}$

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