List questions from elementary-set-theory

Published on 01 Apr 2026 - 15:16

63

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A peculiar family of sets

Published on 12 Mar 2026 - 18:36

300

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Inclusion and Element of in Set theory

Published on 13 Mar 2026 - 8:17

84

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What is difference between $\{(x,y): x< 2 \implies y >2\}$ and $\{(x,y): y > 2 \implies x <2\}$

Published on 12 Mar 2026 - 20:51

72

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Does symmetric difference, coupled with an intersection, respect negation?

Published on 13 Mar 2026 - 10:18

70

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Prove $B = A - (A - B)$

Published on 13 Mar 2026 - 1:02

2k

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union of spans versus span of union of sets

Published on 29 Mar 2026 - 5:12

66

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if $f$ is injective, then is it right $f(B^c) =f(B)^c$?

Published on 13 Mar 2026 - 10:34

90

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How do you denote the statements $(*)$ and $(**)$ using set notation?

Published on 12 Mar 2026 - 23:39

41

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Iterative function on set

Published on 05 Apr 2026 - 14:06

657

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Indexed family of sets defined by a half-open interval

Published on 26 Mar 2026 - 17:13

71

Views

Independence of sigma algebra generated by union of sigma algebra

Published on 12 Mar 2026 - 23:44

42

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Check if $A \subseteq B \land C \subseteq D \Rightarrow A \cap C \subseteq B \cap D$

Published on 13 Mar 2026 - 6:24

85

Views

How many units squares can fit on $\mathbb R^2$?

Published on 25 Mar 2026 - 8:07

95

Views

Show that for each $k\in\Bbb{N}$, $\Bbb{N}_k$ is finite

Published on 25 Mar 2026 - 8:09

List Question

How do I count combinations whose elements are drawn from nested sets?

A peculiar family of sets

Inclusion and Element of in Set theory

What is difference between $\{(x,y): x< 2 \implies y >2\}$ and $\{(x,y): y > 2 \implies x <2\}$

Does symmetric difference, coupled with an intersection, respect negation?

Prove $B = A - (A - B)$

union of spans versus span of union of sets

if $f$ is injective, then is it right $f(B^c) =f(B)^c$?

How do you denote the statements $(*)$ and $(**)$ using set notation?

Iterative function on set

Indexed family of sets defined by a half-open interval

Independence of sigma algebra generated by union of sigma algebra

Check if $A \subseteq B \land C \subseteq D \Rightarrow A \cap C \subseteq B \cap D$

How many units squares can fit on $\mathbb R^2$?

Show that for each $k\in\Bbb{N}$, $\Bbb{N}_k$ is finite

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