Question

Which of the following quantified propositions is true if $ \ U=\mathcal{P} \{1,2,3 \} \ $?

score 423 · Answer 1 · 2026-04-16 07:52:52

423

Views

Which of the following quantified propositions is true if $ \ U=\mathcal{P} \{1,2,3 \} \ $?

Published on 16 Apr 2026 - 7:52

score 322 · Answer 2 · 2026-04-12 18:32:42

322

Views

How to prove statements in formal set theory? Substitution, the empty set and an example.

Published on 12 Apr 2026 - 18:32

score 5k · Answer 3 · 2026-04-16 05:26:32

5k

Views

A sequence of closed bounded (not necessarily nested) intervals $I_1, I_2, I_3,...$ with the property that

Published on 16 Apr 2026 - 5:26

score 35 · Answer 4 · 2026-04-15 08:41:02

35

Views

Is this a correct construction of the underlying sets of free semigroups?

Published on 15 Apr 2026 - 8:41

score 5.9k · Answer 5 · 2026-04-14 07:47:09

5.9k

Views

Proof that the number of proofs is countably infinite

Published on 14 Apr 2026 - 7:47

score 64 · Answer 6 · 2026-04-17 07:13:43

64

Views

How to enter these symbols on a computer

Published on 17 Apr 2026 - 7:13

score 57 · Answer 7 · 2026-04-14 05:33:46

57

Views

Quantifier in FO-Semantics $\min(\min(f(a,b):b\in B):a\in A)=\min(f(a,b):a\in A,b\in B) $

Published on 14 Apr 2026 - 5:33

score 152 · Answer 8 · 2026-04-13 00:01:32

152

Views

Halmos' Naive Set Theory: On expressing $\{\{x,\;y\}:x \in A \textit{ and } y \in A \textit{ and } x \neq y\}$

Published on 13 Apr 2026 - 0:01

score 588 · Answer 9 · 2026-04-15 14:21:58

588

Views

Proving that being $R$ is a relation in a set $A$ and $R^{-1}$ its inverse, satisfy 5 properties between them.

Published on 15 Apr 2026 - 14:21

score 106 · Answer 10 · 2026-04-14 13:39:39

106

Views

Invariant set is union of singletons in Hutchinson's theorem

Published on 14 Apr 2026 - 13:39

score 33 · Answer 11 · 2026-04-11 00:26:12

33

Views

Finding all $x$ above a value

Published on 11 Apr 2026 - 0:26

score 1.4k · Answer 12 · 2026-04-11 19:43:54

1.4k

Views

Meaning behind Filter in Set Theory

Published on 11 Apr 2026 - 19:43

score 75 · Answer 13 · 2026-04-12 08:02:17

75

Views

Is it true, if there is no surjection of A onto B, then there must be injection A onto B??

Published on 12 Apr 2026 - 8:02

score 298 · Answer 14 · 2026-04-17 02:22:14

298

Views

Injective map from $\{0,1\}^{n}$ to $\mathbb{N}$

Published on 17 Apr 2026 - 2:22

score 433 · Answer 15 · 2026-04-15 09:45:19

433

Views

Q: Prove that Cartesian Product is distributive over Minkowski sums

Published on 15 Apr 2026 - 9:45

List Question

Which of the following quantified propositions is true if $ \ U=\mathcal{P} \{1,2,3 \} \ $?

How to prove statements in formal set theory? Substitution, the empty set and an example.

A sequence of closed bounded (not necessarily nested) intervals $I_1, I_2, I_3,...$ with the property that

Is this a correct construction of the underlying sets of free semigroups?

Proof that the number of proofs is countably infinite

How to enter these symbols on a computer

Quantifier in FO-Semantics $\min(\min(f(a,b):b\in B):a\in A)=\min(f(a,b):a\in A,b\in B) $

Halmos' Naive Set Theory: On expressing $\{\{x,\;y\}:x \in A \textit{ and } y \in A \textit{ and } x \neq y\}$

Proving that being $R$ is a relation in a set $A$ and $R^{-1}$ its inverse, satisfy 5 properties between them.

Invariant set is union of singletons in Hutchinson's theorem

Finding all $x$ above a value

Meaning behind Filter in Set Theory

Is it true, if there is no surjection of A onto B, then there must be injection A onto B??

Injective map from $\{0,1\}^{n}$ to $\mathbb{N}$

Q: Prove that Cartesian Product is distributive over Minkowski sums

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