List questions from cardinals

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In set theory, what does the symbol $\mathfrak d$ mean?

Published on 05 Jul 2012 - 12:00

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Is there a way to define the "size" of an infinite set that takes into account "intuitive" differences between sets?

Published on 08 Jul 2012 - 14:23

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About $|\operatorname{Sym}(\Omega)|$ when $\Omega$ is an infinite set.

Published on 11 Jul 2012 - 16:42

518

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$\kappa$-complete, $\lambda$-saturated ideal properties

Published on 14 Jul 2012 - 20:13

691

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Cardinality of the complex numbers in ZF

Published on 09 Apr 2026 - 1:00

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Non-aleph infinite cardinals

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How to prove that $2^\omega=\mathfrak{c}$?

Published on 20 Jul 2012 - 3:17

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Is the axiom of choice needed to show that $a^2=a$?

Published on 06 Apr 2026 - 20:12

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Cardinality of a union of uncountable and countable set.

Published on 24 Jul 2012 - 21:47

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What is the standard proof that $\dim(k^{\mathbb N})$ is uncountable?

Published on 29 Jul 2012 - 13:46

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Cocountable fibers

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some elementary questions about cardinality

Published on 06 Apr 2026 - 22:00

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Show that for $n, m \in \omega$, the ordinal and cardinal exponentiations $n^m$

Published on 04 Apr 2026 - 21:01

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Why is the cardinality of irrational numbers greater than rational numbers?

Published on 09 Aug 2012 - 6:58

List Question

Number of natural and real numbers

In set theory, what does the symbol $\mathfrak d$ mean?

Is there a way to define the "size" of an infinite set that takes into account "intuitive" differences between sets?

About $|\operatorname{Sym}(\Omega)|$ when $\Omega$ is an infinite set.

$\kappa$-complete, $\lambda$-saturated ideal properties

Cardinality of the complex numbers in ZF

Non-aleph infinite cardinals

How to prove that $2^\omega=\mathfrak{c}$?

Is the axiom of choice needed to show that $a^2=a$?

Cardinality of a union of uncountable and countable set.

What is the standard proof that $\dim(k^{\mathbb N})$ is uncountable?

Cocountable fibers

some elementary questions about cardinality

Show that for $n, m \in \omega$, the ordinal and cardinal exponentiations $n^m$

Why is the cardinality of irrational numbers greater than rational numbers?

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