Question

Justification of ZFC without using Con(ZFC)?

score 532 · Answer 1 · 2026-03-31 21:53:09

532

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Justification of ZFC without using Con(ZFC)?

Published on 31 Mar 2026 - 21:53

score 252 · Answer 2 · 2016-05-14 18:56:25

252

Views

Order type of a sum ($\bigcup$) of sets

Published on 14 May 2016 - 18:56

score 132 · Answer 3 · 2016-05-17 16:49:37

132

Views

Checking whether some sets are clubs in $ \aleph_2 $ and $ \aleph_1 $

Published on 17 May 2016 - 16:49

score 45 · Answer 4 · 2016-05-17 18:58:42

45

Views

Unboundedness of the set of subgroups of a cardinal

Published on 17 May 2016 - 18:58

score 101 · Answer 5 · 2016-05-17 20:48:49

101

Views

If $ \bigcup N_\alpha $ is stationary, then $ \{ \min(N_\alpha) \}$ is stationary

Published on 17 May 2016 - 20:48

score 1.7k · Answer 6 · 2016-05-18 17:45:33

1.7k

Views

Trying to understand the sum of ordinals

Published on 18 May 2016 - 17:45

score 34 · Answer 7 · 2016-05-18 22:59:16

34

Views

Ordinals defined by successor and union

Published on 18 May 2016 - 22:59

score 176 · Answer 8 · 2016-05-19 14:29:16

176

Views

Order-preserving maps on a directed-complete poset

Published on 19 May 2016 - 14:29

score 236 · Answer 9 · 2016-05-22 01:45:46

236

Views

Does the MK axiom of infinity and the Power set axiom hold in the cumulative hierarchy?

Published on 22 May 2016 - 1:45

score 2.5k · Answer 10 · 2026-03-26 04:32:35

2.5k

Views

Is it really impossible to lose the Hydra game?

Published on 26 Mar 2026 - 4:32

score 204 · Answer 11 · 2016-05-29 20:15:03

204

Views

Does $1-\frac{1}{2^\omega}$ equal 1? What about $1-\frac{1}{2^{\aleph_0}}$?

Published on 29 May 2016 - 20:15

score 59 · Answer 12 · 2016-05-30 17:53:10

59

Views

Ordinal Arithmetic Identity

Published on 30 May 2016 - 17:53

score 443 · Answer 13 · 2016-05-31 09:23:31

443

Views

Some ordinal arithmetic exercises

Published on 31 May 2016 - 9:23

score 124 · Answer 14 · 2016-05-31 14:35:35

124

Views

Why can we choose a greatest ordinal $\beta$, such that $\omega^\beta\leq \alpha$?

Published on 31 May 2016 - 14:35

score 165 · Answer 15 · 2016-06-01 07:32:13

165

Views

Is there a key difference between the principle of transfinite induction and the principle of transfinite induction for ordinals?

Published on 01 Jun 2016 - 7:32

List Question

Justification of ZFC without using Con(ZFC)?

Order type of a sum ($\bigcup$) of sets

Checking whether some sets are clubs in $ \aleph_2 $ and $ \aleph_1 $

Unboundedness of the set of subgroups of a cardinal

If $ \bigcup N_\alpha $ is stationary, then $ \{ \min(N_\alpha) \}$ is stationary

Trying to understand the sum of ordinals

Ordinals defined by successor and union

Order-preserving maps on a directed-complete poset

Does the MK axiom of infinity and the Power set axiom hold in the cumulative hierarchy?

Is it really impossible to lose the Hydra game?

Does $1-\frac{1}{2^\omega}$ equal 1? What about $1-\frac{1}{2^{\aleph_0}}$?

Ordinal Arithmetic Identity

Some ordinal arithmetic exercises

Why can we choose a greatest ordinal $\beta$, such that $\omega^\beta\leq \alpha$?

Is there a key difference between the principle of transfinite induction and the principle of transfinite induction for ordinals?

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