Question

Description of the image of a function

score 55 · Answer 1 · 2026-04-17 09:44:01

55

Views

Description of the image of a function

Published on 17 Apr 2026 - 9:44

score 169 · Answer 2 · 2026-04-13 20:56:39

169

Views

Amount of all subsets of size $n$ in a set with $e$ elements

Published on 13 Apr 2026 - 20:56

score 874 · Answer 3 · 2026-04-13 22:06:02

874

Views

Elementary Set Theory ~ prove that Intersection of Partitions is also a partition

Published on 13 Apr 2026 - 22:06

score 74 · Answer 4 · 2026-04-12 22:18:47

74

Views

Arbitrary Intersection between $\mathbb{R, N, Z}$

Published on 12 Apr 2026 - 22:18

score 1.2k · Answer 5 · 2026-04-15 17:32:56

1.2k

Views

$S$ is closed under pairwise unions $⇒$ $S$ is closed under arbitrary unions?

Published on 15 Apr 2026 - 17:32

score 71 · Answer 6 · 2026-04-11 04:35:57

71

Views

Is this set uncountable?

Published on 11 Apr 2026 - 4:35

score 783 · Answer 7 · 2026-04-14 22:50:10

783

Views

Prove that a countably infinite union of subsets of a finite set, can be expressed as a finite union

Published on 14 Apr 2026 - 22:50

score 998 · Answer 8 · 2026-04-16 02:55:46

998

Views

Give an example of sets $X,Y$, subset $A,B \subseteq X$ and a function $f:X→Y$ such that $f[A \cap B ]$ $\neq$ $f[A] \cap [B]$

Published on 16 Apr 2026 - 2:55

score 16 · Answer 9 · 2026-04-12 05:05:09

16

Views

Describing the relation $R$ in the $xy$-plane and finding $R[A]$

Published on 12 Apr 2026 - 5:05

score 83 · Answer 10 · 2026-04-13 16:43:38

83

Views

Equivalent subset relation

Published on 13 Apr 2026 - 16:43

score 60 · Answer 11 · 2026-04-14 20:49:07

60

Views

Name for a set in which some of the elements are also contained in other set elements?

Published on 14 Apr 2026 - 20:49

score 44 · Answer 12 · 2026-04-13 08:02:02

44

Views

Are equations correct? counterexamples

Published on 13 Apr 2026 - 8:02

score 72 · Answer 13 · 2026-04-09 12:26:54

72

Views

Finding surjection from injection

Published on 09 Apr 2026 - 12:26

score 67 · Answer 14 · 2026-04-13 23:23:46

67

Views

Is the union of countable sets (S)U(S x S)U(S x S x S)U..... countable?

Published on 13 Apr 2026 - 23:23

score 58 · Answer 15 · 2026-04-16 10:05:04

58

Views

What is the number of elements of $ |\mathbb{Q} $ \ $ \mathbb{Z}| $?

Published on 16 Apr 2026 - 10:05

List Question

Description of the image of a function

Amount of all subsets of size $n$ in a set with $e$ elements

Elementary Set Theory ~ prove that Intersection of Partitions is also a partition

Arbitrary Intersection between $\mathbb{R, N, Z}$

$S$ is closed under pairwise unions $⇒$ $S$ is closed under arbitrary unions?

Is this set uncountable?

Prove that a countably infinite union of subsets of a finite set, can be expressed as a finite union

Give an example of sets $X,Y$, subset $A,B \subseteq X$ and a function $f:X→Y$ such that $f[A \cap B ]$ $\neq$ $f[A] \cap [B]$

Describing the relation $R$ in the $xy$-plane and finding $R[A]$

Equivalent subset relation

Name for a set in which some of the elements are also contained in other set elements?

Are equations correct? counterexamples

Finding surjection from injection

Is the union of countable sets (S)U(S x S)U(S x S x S)U..... countable?

What is the number of elements of $ |\mathbb{Q} $ \ $ \mathbb{Z}| $?

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