List questions from cardinals

Published on 20 Dec 2013 - 16:33

795

Views

Bijection between countable ordinals and reals

Published on 03 Apr 2026 - 8:18

954

Views

Largest infinite cardinal used in a proof

Published on 05 Apr 2026 - 23:06

47

Views

Trying to understand an equality between sets

Published on 22 Dec 2013 - 14:27

165

Views

$(k^{<\lambda})^{<\lambda}=k^{<\lambda}$ if $\lambda$ is regular

Published on 23 Dec 2013 - 0:28

196

Views

What is the meaning of $n\in \aleph$

Published on 23 Dec 2013 - 14:10

172

Views

countable or not countable

Published on 26 Dec 2013 - 22:46

266

Views

Proving that $|\{B\subseteq S: |B|<\infty \}|=|S|$

Published on 29 Dec 2013 - 3:03

1.6k

Views

Cardinality of all sequences of non-negative integers with finite number of non-zero terms. (NBHM 2012)

Published on 29 Dec 2013 - 17:06

971

Views

Cantor's infinities, and the cardinality of reals vs. complex

Published on 02 Jan 2014 - 5:26

318

Views

Every club of $\kappa$ in $M[G]$ contains a club in $M$.

Published on 28 Mar 2026 - 14:00

307

Views

What would a world where $\mathsf{CH}$ is false look like?

Published on 04 Jan 2014 - 16:32

118

Views

chain A s.t. $|X|<|A|\leq |P(X)|$

Published on 06 Jan 2014 - 10:12

74

Views

Prove that for every $ \quad n\in\mathbb{N},\quad \mathbb{R}^{n} = \mathfrak{c}$?

Published on 08 Jan 2014 - 21:08

88

Views

What is the defenition of $\mathcal{c}$ and $\aleph_1$ if we assume ZFC without CH.

Published on 09 Jan 2014 - 16:23

List Question

Cardinality of cantor set $K$

Bijection between countable ordinals and reals

Largest infinite cardinal used in a proof

Trying to understand an equality between sets

$(k^{<\lambda})^{<\lambda}=k^{<\lambda}$ if $\lambda$ is regular

What is the meaning of $n\in \aleph$

countable or not countable

Proving that $|\{B\subseteq S: |B|<\infty \}|=|S|$

Cardinality of all sequences of non-negative integers with finite number of non-zero terms. (NBHM 2012)

Cantor's infinities, and the cardinality of reals vs. complex

Every club of $\kappa$ in $M[G]$ contains a club in $M$.

What would a world where $\mathsf{CH}$ is false look like?

chain A s.t. $|X|<|A|\leq |P(X)|$

Prove that for every $ \quad n\in\mathbb{N},\quad \mathbb{R}^{n} = \mathfrak{c}$?

What is the defenition of $\mathcal{c}$ and $\aleph_1$ if we assume ZFC without CH.

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