List questions from elementary-set-theory

Published on 23 Mar 2026 - 1:13

59

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Extend an automorphism from a partially ordered set $P$ to the complete Boolean algebra $B(P)$.

Published on 26 Mar 2026 - 9:30

366

Views

Cardinality of the irrational numbers vs the rationals

Published on 25 Mar 2026 - 12:54

378

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Symmetric difference as a equivalent relation-equivalence classes

Published on 03 Apr 2026 - 18:17

42

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Special kind of partition

Published on 01 Apr 2026 - 4:19

116

Views

Probability and Set Theory

Published on 10 Apr 2026 - 13:26

32

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Class of all σ-fields containing a class

Published on 06 Apr 2026 - 14:16

207

Views

Why is partial ordering by continuation (vs just inclusion) required for Zorn's Lemma $\implies$ Well Ordering Theorem?

Published on 22 Mar 2026 - 16:46

139

Views

Where am I making a mistake in showing that countability isn't a thing?

Published on 08 Apr 2026 - 23:10

165

Views

Relations as Sets of Ordered Pairs

Published on 01 Apr 2026 - 18:48

53

Views

Can anybody give me a description about this?

Published on 22 Mar 2026 - 23:52

96

Views

Proof of $A \setminus B= A$ st $A \subset B$

Published on 23 Mar 2026 - 12:43

171

Views

The need for rigorous proofs in Sets

Published on 27 Mar 2026 - 15:38

93

Views

Prove that there is a maximum subset of $\mathbb{N}$ who is closed under summation and does not contain any prime number.

Published on 25 Mar 2026 - 6:07

197

Views

Prove that $A \smallsetminus (A \smallsetminus B) = A \cap B$

Published on 22 Mar 2026 - 16:34

List Question

Image of $\mathbb{N}\setminus\{n\}$ under the map $T$

Extend an automorphism from a partially ordered set $P$ to the complete Boolean algebra $B(P)$.

Cardinality of the irrational numbers vs the rationals

Symmetric difference as a equivalent relation-equivalence classes

Special kind of partition

Probability and Set Theory

Class of all σ-fields containing a class

Why is partial ordering by continuation (vs just inclusion) required for Zorn's Lemma $\implies$ Well Ordering Theorem?

Where am I making a mistake in showing that countability isn't a thing?

Relations as Sets of Ordered Pairs

Can anybody give me a description about this?

Proof of $A \setminus B= A$ st $A \subset B$

The need for rigorous proofs in Sets

Prove that there is a maximum subset of $\mathbb{N}$ who is closed under summation and does not contain any prime number.

Prove that $A \smallsetminus (A \smallsetminus B) = A \cap B$

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