List questions from ordinals

Published on 09 Dec 2012 - 10:42

418

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Does every infinite well-ordered set have an initial segment isomorphic to $\mathbb N$?

Published on 09 Dec 2012 - 11:58

208

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Ordered Ordinals - continuum hypothesis

Published on 09 Dec 2012 - 12:07

822

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If $\alpha$ is an indecomposable ordinal, why $\Gamma(\alpha\times{\alpha})=\alpha$?

Published on 10 Dec 2012 - 16:53

350

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Proving properties of enumeration of infinite cardinals

Published on 11 Dec 2012 - 13:50

90

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Constructing a bijection between $\xi$ and $\xi + 1$

Published on 12 Dec 2012 - 15:24

495

Views

Question about proof of Hessenberg: $\kappa \cdot \lambda = \lambda$

Published on 13 Dec 2012 - 13:32

263

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Question about a proof about singular cardinals

Published on 15 Dec 2012 - 11:26

1.6k

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What is the cardinality of the countable ordinals?

Published on 29 Dec 2012 - 16:55

328

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Ordinals definable over $L_\kappa$

Published on 05 Apr 2026 - 0:05

325

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Non-measurable subset of $\omega_1$

Published on 01 Jan 2013 - 20:51

202

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Proving that an initial infinite ordinal is a limit ordinal

Published on 07 Jan 2013 - 0:16

469

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Proving of existence of limit ordinal

Published on 09 Jan 2013 - 1:30

134

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$\alpha = \omega^\beta(\gamma+1)$

Published on 11 Jan 2013 - 13:05

320

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Two questions regarding Ordinal Numbers.

Published on 12 Jan 2013 - 16:08

List Question

Proof that for every $X$ $\exists !$ one initial ordinal

Does every infinite well-ordered set have an initial segment isomorphic to $\mathbb N$?

Ordered Ordinals - continuum hypothesis

If $\alpha$ is an indecomposable ordinal, why $\Gamma(\alpha\times{\alpha})=\alpha$?

Proving properties of enumeration of infinite cardinals

Constructing a bijection between $\xi$ and $\xi + 1$

Question about proof of Hessenberg: $\kappa \cdot \lambda = \lambda$

Question about a proof about singular cardinals

What is the cardinality of the countable ordinals?

Ordinals definable over $L_\kappa$

Non-measurable subset of $\omega_1$

Proving that an initial infinite ordinal is a limit ordinal

Proving of existence of limit ordinal

$\alpha = \omega^\beta(\gamma+1)$

Two questions regarding Ordinal Numbers.

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