Question

Motivation of the von Neumann definition of ordinals

score 416 · Answer 1 · 2019-04-15 23:01:56

416

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Motivation of the von Neumann definition of ordinals

Published on 15 Apr 2019 - 23:01

score 53 · Answer 2 · 2019-04-17 23:36:23

53

Views

Basic Proposition of Cardinals

Published on 17 Apr 2019 - 23:36

score 139 · Answer 3 · 2026-03-25 09:31:43

139

Views

Lowest Unique Ordinal Game

Published on 25 Mar 2026 - 9:31

score 177 · Answer 4 · 2019-04-24 15:42:56

177

Views

How can I compute the 'average rank' of an infinite set?

Published on 24 Apr 2019 - 15:42

score 62 · Answer 5 · 2019-04-25 09:25:09

62

Views

Regressive functions on countable ordinals

Published on 25 Apr 2019 - 9:25

score 50 · Answer 6 · 2026-03-25 21:53:16

50

Views

Provable well-founded ordering

Published on 25 Mar 2026 - 21:53

score 294 · Answer 7 · 2019-04-29 12:05:36

294

Views

If $\alpha\le\beta$ are ordinal numbers, then the equation $\xi+\alpha=\beta$ cannot have exactly $n$ solutions in $\xi$, for $1<n<\omega$

Published on 29 Apr 2019 - 12:05

score 341 · Answer 8 · 2019-04-29 23:06:22

341

Views

Prove that $\alpha$ is a limit ordinal iff $\alpha = \sup(\alpha)$.

Published on 29 Apr 2019 - 23:06

score 184 · Answer 9 · 2019-05-01 05:18:28

184

Views

Cardinality of a union of ordinal-indexed nested sets with bounded cardinality?

Published on 01 May 2019 - 5:18

score 176 · Answer 10 · 2019-05-01 21:03:59

176

Views

¿Is, for $1\le n<\omega ,\;(\omega+n)^{\omega}=\omega^{\omega}$?

Published on 01 May 2019 - 21:03

score 87 · Answer 11 · 2019-05-02 21:23:45

Sum of a= ord(A) and of b= ord(B) defined as ord ( {A, B} ) . Trying to understand 2 examples given by Lipschutz, Theory and Problems Of Set Theory

score 91 · Answer 12 · 2019-05-02 22:01:41

91

Views

Why is " omega" = ord (N) a " limit element".

Published on 02 May 2019 - 22:01

score 76 · Answer 13 · 2019-05-06 05:37:19

76

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Recursive way of calculating cofinality of ordinals

Published on 06 May 2019 - 5:37

score 373 · Answer 14 · 2026-03-26 04:32:22

373

Views

Why are ordinals multiplied in reverse order

Published on 26 Mar 2026 - 4:32

score 88 · Answer 15 · 2019-05-10 20:25:59

88

Views

Show that there exists non-zero countable ordinal $\delta$ such that $\omega\delta=\delta$

Published on 10 May 2019 - 20:25

List Question

Motivation of the von Neumann definition of ordinals

Basic Proposition of Cardinals

Lowest Unique Ordinal Game

How can I compute the 'average rank' of an infinite set?

Regressive functions on countable ordinals

Provable well-founded ordering

If $\alpha\le\beta$ are ordinal numbers, then the equation $\xi+\alpha=\beta$ cannot have exactly $n$ solutions in $\xi$, for $1<n<\omega$

Prove that $\alpha$ is a limit ordinal iff $\alpha = \sup(\alpha)$.

Cardinality of a union of ordinal-indexed nested sets with bounded cardinality?

¿Is, for $1\le n<\omega ,\;(\omega+n)^{\omega}=\omega^{\omega}$?

Sum of a= ord(A) and of b= ord(B) defined as ord ( {A, B} ) . Trying to understand 2 examples given by Lipschutz, Theory and Problems Of Set Theory

Why is " omega" = ord (N) a " limit element".

Recursive way of calculating cofinality of ordinals

Why are ordinals multiplied in reverse order

Show that there exists non-zero countable ordinal $\delta$ such that $\omega\delta=\delta$

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