Question

Is Universal set undefined?

score 109 · Answer 1 · 2026-04-08 17:12:19

109

Views

Is Universal set undefined?

Published on 08 Apr 2026 - 17:12

score 65 · Answer 2 · 2026-04-15 22:02:17

65

Views

If $x$ is a set of ordinals, then $\bigcup x=\alpha$. Why is $x\subseteq \alpha+1$ rather than $\alpha$

Published on 15 Apr 2026 - 22:02

score 279 · Answer 3 · 2026-04-09 16:57:16

279

Views

Is it possible to implement a stack data structure using sets and set theory?

Published on 09 Apr 2026 - 16:57

score 258 · Answer 4 · 2026-04-15 23:52:52

258

Views

Why would it be incorrect to describe to the vectors of an infinite dimensional vector space as infinite tuples?

Published on 15 Apr 2026 - 23:52

score 90 · Answer 5 · 2026-04-12 04:12:53

90

Views

Mutually exclusive probabilities

Published on 12 Apr 2026 - 4:12

score 219 · Answer 6 · 2026-04-12 21:39:58

219

Views

Confusion regarding transitive set $X$ and the relation $\in$ on $X$

Published on 12 Apr 2026 - 21:39

score 119 · Answer 7 · 2026-04-17 07:34:42

119

Views

Cancellation law for forward and backward images

Published on 17 Apr 2026 - 7:34

score 42 · Answer 8 · 2026-04-15 19:33:11

42

Views

Showing 2 sets have equal cardinality

Published on 15 Apr 2026 - 19:33

score 2.2k · Answer 9 · 2026-04-12 18:29:17

2.2k

Views

Difference between $x\in[0,1]$ and $x\in \{0,1\}$?

Published on 12 Apr 2026 - 18:29

score 183 · Answer 10 · 2026-04-13 02:06:48

183

Views

Doubts about cartesian product existence.

Published on 13 Apr 2026 - 2:06

score 1.1k · Answer 11 · 2026-04-14 07:48:15

1.1k

Views

Arranging $\mathbb N$ into a two-dimensional array to prove a countably infinite collection of countable sets is countable.

Published on 14 Apr 2026 - 7:48

score 726 · Answer 12 · 2026-04-13 05:58:05

726

Views

the cardinality of all finite subsets of real numbers

Published on 13 Apr 2026 - 5:58

score 821 · Answer 13 · 2026-04-14 08:47:19

821

Views

An example of an uncountable collection of disjoint open intervals? Possible?

Published on 14 Apr 2026 - 8:47

score 279 · Answer 14 · 2026-04-12 04:21:02

279

Views

The open $(0,1) \times (0,1)$ square invectively mapped into the interval $(0,1)$

Published on 12 Apr 2026 - 4:21

score 64 · Answer 15 · 2026-04-13 22:46:13

64

Views

Countability and intersection of sets.

Published on 13 Apr 2026 - 22:46

List Question

Is Universal set undefined?

If $x$ is a set of ordinals, then $\bigcup x=\alpha$. Why is $x\subseteq \alpha+1$ rather than $\alpha$

Is it possible to implement a stack data structure using sets and set theory?

Why would it be incorrect to describe to the vectors of an infinite dimensional vector space as infinite tuples?

Mutually exclusive probabilities

Confusion regarding transitive set $X$ and the relation $\in$ on $X$

Cancellation law for forward and backward images

Showing 2 sets have equal cardinality

Difference between $x\in[0,1]$ and $x\in \{0,1\}$?

Doubts about cartesian product existence.

Arranging $\mathbb N$ into a two-dimensional array to prove a countably infinite collection of countable sets is countable.

the cardinality of all finite subsets of real numbers

An example of an uncountable collection of disjoint open intervals? Possible?

The open $(0,1) \times (0,1)$ square invectively mapped into the interval $(0,1)$

Countability and intersection of sets.

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