Question

What is the largest set for which its set of self bijections is countable?

score 1.7k · Answer 1 · 2026-04-04 03:53:23

1.7k

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What is the largest set for which its set of self bijections is countable?

Published on 04 Apr 2026 - 3:53

score 523 · Answer 2 · 2026-04-04 03:52:32

523

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Unique infinite subsets of the integers

Published on 04 Apr 2026 - 3:52

score 1.1k · Answer 3 · 2015-12-28 12:05:49

1.1k

Views

Show that the union of two sets of the same cardinality has again the same cardinality.

Published on 28 Dec 2015 - 12:05

score 585 · Answer 4 · 2015-12-30 18:36:45

585

Views

Cardinality of the set of all real functions which have a countable set of discontinuities

Published on 30 Dec 2015 - 18:36

score 645 · Answer 5 · 2016-01-01 10:55:21

645

Views

Why are Aleph numbers by definition of the form $2^x$?

Published on 01 Jan 2016 - 10:55

score 122 · Answer 6 · 2026-04-04 03:58:09

122

Views

Is this interpretation of the continuum hypothesis correct?

Published on 04 Apr 2026 - 3:58

score 561 · Answer 7 · 2026-04-04 03:58:09

561

Views

Where is the flaw in my Continuum Hypothesis Proof?

Published on 04 Apr 2026 - 3:58

score 57 · Answer 8 · 2016-01-06 15:09:08

57

Views

Cardinal of a difference of power sets

Published on 06 Jan 2016 - 15:09

score 61 · Answer 9 · 2016-01-08 01:25:47

61

Views

Is this function one to one? Why?

Published on 08 Jan 2016 - 1:25

score 389 · Answer 10 · 2026-03-30 17:53:21

389

Views

Can every set be expressed as the union of a chain of sets of lesser cardinality?

Published on 30 Mar 2026 - 17:53

score 265 · Answer 11 · 2026-04-03 14:02:33

265

Views

Ordinal with given cardinality (without AC)

Published on 03 Apr 2026 - 14:02

score 143 · Answer 12 · 2016-01-10 01:22:44

143

Views

What do you call a cardinal $\kappa$ that is a limit of $\kappa$-many cardinals?

Published on 10 Jan 2016 - 1:22

score 56 · Answer 13 · 2016-01-10 09:42:36

56

Views

Need a formal proof?

Published on 10 Jan 2016 - 9:42

score 108 · Answer 14 · 2026-04-04 03:52:49

108

Views

More numbers between $2$ and $4$ than between $2$ and $3$? (I am not a mathematician.)

Published on 04 Apr 2026 - 3:52

score 123 · Answer 15 · 2026-03-28 03:26:23

123

Views

Minimal Possible Ordinal for a Cardinal

Published on 28 Mar 2026 - 3:26

List Question

What is the largest set for which its set of self bijections is countable?

Unique infinite subsets of the integers

Show that the union of two sets of the same cardinality has again the same cardinality.

Cardinality of the set of all real functions which have a countable set of discontinuities

Why are Aleph numbers by definition of the form $2^x$?

Is this interpretation of the continuum hypothesis correct?

Where is the flaw in my Continuum Hypothesis Proof?

Cardinal of a difference of power sets

Is this function one to one? Why?

Can every set be expressed as the union of a chain of sets of lesser cardinality?

Ordinal with given cardinality (without AC)

What do you call a cardinal $\kappa$ that is a limit of $\kappa$-many cardinals?

Need a formal proof?

More numbers between $2$ and $4$ than between $2$ and $3$? (I am not a mathematician.)

Minimal Possible Ordinal for a Cardinal

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