Question

How to understand the regular cardinal?

score 5k · Answer 1 · 2012-01-11 08:06:20

5k

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How to understand the regular cardinal?

Published on 11 Jan 2012 - 8:06

score 521 · Answer 2 · 2012-01-13 04:50:47

521

Views

How to prove that every infinite cardinal is equal to $\omega_\alpha$ for some $\alpha$?

Published on 13 Jan 2012 - 4:50

score 214 · Answer 3 · 2012-01-19 00:49:39

214

Views

The minimal cardinal set from a choice between a set and its complement

Published on 19 Jan 2012 - 0:49

score 2.2k · Answer 4 · 2012-01-20 18:36:46

2.2k

Views

Multiplying Infinite Cardinals (by Zero Specifically)

Published on 20 Jan 2012 - 18:36

score 115 · Answer 5 · 2012-01-20 19:05:22

115

Views

What would be the consequence of restricting multiplication by Zero to only Finite Cardinals?

Published on 20 Jan 2012 - 19:05

score 2k · Answer 6 · 2026-04-09 04:12:36

2k

Views

A question about cardinal arithmetics without the Axiom of Choice

Published on 09 Apr 2026 - 4:12

score 679 · Answer 7 · 2026-04-08 18:02:01

679

Views

A cardinal exponentiation question

Published on 08 Apr 2026 - 18:02

score 532 · Answer 8 · 2012-01-30 05:11:39

532

Views

Is $2^\infty$ uncountable and is cardinality a continuous function?

Published on 30 Jan 2012 - 5:11

score 482 · Answer 9 · 2012-02-02 20:40:32

482

Views

Enumeration of real 'sequences', cardinality, Cantors diagonal argument.

Published on 02 Feb 2012 - 20:40

score 482 · Answer 10 · 2026-04-05 15:56:52

482

Views

The group of permutations with almost all points fixed is a maximal normal subgroup of the symmetric group.

Published on 05 Apr 2026 - 15:56

score 524 · Answer 11 · 2012-02-09 03:16:10

524

Views

Cardinality and ordinary mathematical induction

Published on 09 Feb 2012 - 3:16

score 7.7k · Answer 12 · 2012-02-09 21:35:08

7.7k

Views

An infinite subset of a countable set is countable

Published on 09 Feb 2012 - 21:35

score 1.3k · Answer 13 · 2012-02-11 00:03:45

1.3k

Views

What is the cardinal number of all strictly increasing sequences?

Published on 11 Feb 2012 - 0:03

score 6.1k · Answer 14 · 2012-02-13 08:01:53

6.1k

Views

Does a injective function $f: A \to B$ and surjective function $g : A\to B$ imply a bijective function exists?

Published on 13 Feb 2012 - 8:01

score 1.1k · Answer 15 · 2012-02-16 13:29:31

1.1k

Views

Ideals in the ring of endomorphisms of a vector space of uncountably infinite dimension.

Published on 16 Feb 2012 - 13:29

List Question

How to understand the regular cardinal?

How to prove that every infinite cardinal is equal to $\omega_\alpha$ for some $\alpha$?

The minimal cardinal set from a choice between a set and its complement

Multiplying Infinite Cardinals (by Zero Specifically)

What would be the consequence of restricting multiplication by Zero to only Finite Cardinals?

A question about cardinal arithmetics without the Axiom of Choice

A cardinal exponentiation question

Is $2^\infty$ uncountable and is cardinality a continuous function?

Enumeration of real 'sequences', cardinality, Cantors diagonal argument.

The group of permutations with almost all points fixed is a maximal normal subgroup of the symmetric group.

Cardinality and ordinary mathematical induction

An infinite subset of a countable set is countable

What is the cardinal number of all strictly increasing sequences?

Does a injective function $f: A \to B$ and surjective function $g : A\to B$ imply a bijective function exists?

Ideals in the ring of endomorphisms of a vector space of uncountably infinite dimension.

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