Question

A generalization of the concept of finiteness

score 104 · Answer 1 · 2019-08-04 14:35:16

104

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A generalization of the concept of finiteness

Published on 04 Aug 2019 - 14:35

score 63 · Answer 2 · 2019-08-06 14:08:43

63

Views

unknown existence of bijection

Published on 06 Aug 2019 - 14:08

score 32 · Answer 3 · 2019-08-07 12:24:17

32

Views

An elementary question about cardinal arithmetic without AC

Published on 07 Aug 2019 - 12:24

score 142 · Answer 4 · 2019-08-08 09:15:22

142

Views

Are cardinals with the same "continuum function" equal?

Published on 08 Aug 2019 - 9:15

score 315 · Answer 5 · 2019-08-09 13:13:12

315

Views

Set of disjoint circles of radius $1$ on the plane countable?

Published on 09 Aug 2019 - 13:13

score 342 · Answer 6 · 2026-03-25 16:45:40

342

Views

Visualisation of ordinal vs cardinal arithmetic

Published on 25 Mar 2026 - 16:45

score 166 · Answer 7 · 2019-08-10 14:38:41

166

Views

how to prove that: $|X| = 2^{\aleph_{0}}$, given $X = \{ A\in P(\mathbb{N}) \vert \ |A^{c}| = \aleph_{0} \}$

Published on 10 Aug 2019 - 14:38

score 82 · Answer 8 · 2019-08-10 22:41:31

82

Views

$\mid{B}\mid=\aleph_0 , A\cap{B}=\emptyset$. Prove $\mid{A} \cup B \mid\,=\,\mid{A} \mid$

Published on 10 Aug 2019 - 22:41

score 149 · Answer 9 · 2026-03-25 15:59:07

149

Views

Consistency of $\mathfrak{b}<\mathfrak{s}$

Published on 25 Mar 2026 - 15:59

score 67 · Answer 10 · 2019-08-11 06:20:01

67

Views

Two well-orderings of an infinite cardinal agree on a large set (Part II)

Published on 11 Aug 2019 - 6:20

score 177 · Answer 11 · 2026-03-26 23:09:39

177

Views

Different sets of glyphs for aleph-numbers

Published on 26 Mar 2026 - 23:09

score 213 · Answer 12 · 2019-08-12 04:27:01

213

Views

An infinite cardinal number into a power of a finite cardinal number

Published on 12 Aug 2019 - 4:27

score 294 · Answer 13 · 2019-08-13 16:19:33

294

Views

Prove: there exists 3 sets: $A, B, C \subseteq \mathbb{N}$ such that: $A\cap B\cap C =\emptyset$ and $|A|=|B|=|C|=\aleph_0$?

Published on 13 Aug 2019 - 16:19

score 88 · Answer 14 · 2026-03-26 04:32:25

88

Views

Long sequences in singular cardinals can't be cofinal

Published on 26 Mar 2026 - 4:32

score 214 · Answer 15 · 2026-03-26 21:25:43

214

Views

Guide to cardinals and ordinals

Published on 26 Mar 2026 - 21:25

List Question

A generalization of the concept of finiteness

unknown existence of bijection

An elementary question about cardinal arithmetic without AC

Are cardinals with the same "continuum function" equal?

Set of disjoint circles of radius $1$ on the plane countable?

Visualisation of ordinal vs cardinal arithmetic

how to prove that: $|X| = 2^{\aleph_{0}}$, given $X = \{ A\in P(\mathbb{N}) \vert \ |A^{c}| = \aleph_{0} \}$

$\mid{B}\mid=\aleph_0 , A\cap{B}=\emptyset$. Prove $\mid{A} \cup B \mid\,=\,\mid{A} \mid$

Consistency of $\mathfrak{b}<\mathfrak{s}$

Two well-orderings of an infinite cardinal agree on a large set (Part II)

Different sets of glyphs for aleph-numbers

An infinite cardinal number into a power of a finite cardinal number

Prove: there exists 3 sets: $A, B, C \subseteq \mathbb{N}$ such that: $A\cap B\cap C =\emptyset$ and $|A|=|B|=|C|=\aleph_0$?

Long sequences in singular cardinals can't be cofinal

Guide to cardinals and ordinals

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