Question

Why do we need classes to list all cardinal numbers?

score 155 · Answer 1 · 2026-04-12 19:45:24

155

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Why do we need classes to list all cardinal numbers?

Published on 12 Apr 2026 - 19:45

score 52 · Answer 2 · 2026-04-11 05:19:51

52

Views

Is certain function on sets transitive?

Published on 11 Apr 2026 - 5:19

score 67 · Answer 3 · 2026-04-15 14:04:24

67

Views

$Vld\left(\frac{X = X \cap Y}{X \subseteq Y}\right) true \ or false$

Published on 15 Apr 2026 - 14:04

score 87 · Answer 4 · 2026-04-17 09:33:17

Any order isomorphism $F$ between $\mathcal{P}(A)$ and $\mathcal{P}(B)$ W.R.T. $\subseteq$ must be $F:X\mapsto\{f(x)\mid x\in X\}$ for some $f:A\to B$

score 49 · Answer 5 · 2026-04-12 09:51:10

I have a maths question suggesting that it is possible to draw a venn diagram where $A \cup C \ne C$ and $A \cup C \ne A$

score 63 · Answer 6 · 2026-03-25 16:06:02

63

Views

Equivalence Relations Reasoning

Published on 25 Mar 2026 - 16:06

score 51 · Answer 7 · 2026-04-12 12:36:56

51

Views

What is the subset that makes the function bijective?

Published on 12 Apr 2026 - 12:36

score 329 · Answer 8 · 2026-04-15 03:25:57

329

Views

Prove that the function f(x,y) = x - y is not a bijection.

Published on 15 Apr 2026 - 3:25

score 1.7k · Answer 9 · 2026-04-13 14:18:47

1.7k

Views

Determining the size of subsets.

Published on 13 Apr 2026 - 14:18

score 1k · Answer 10 · 2026-04-16 10:26:09

1k

Views

Show that the quadratic congruence $x^2+x+1≡0$ (mod p) has an integer solution iff -3 is a QR modulo p.

Published on 16 Apr 2026 - 10:26

score 40 · Answer 11 · 2026-04-11 21:54:39

40

Views

Give a mathematical derivation of the formula by appealing to probability axioms or set operation rules

Published on 11 Apr 2026 - 21:54

score 313 · Answer 12 · 2026-04-10 00:14:47

313

Views

How to define addition on the naturals as a function rather than with the successor "function".

Published on 10 Apr 2026 - 0:14

score 516 · Answer 13 · 2026-03-25 14:19:32

516

Views

Equivalence Relations without Equality

Published on 25 Mar 2026 - 14:19

score 145 · Answer 14 · 2026-04-13 21:02:03

145

Views

Infinite cartesian product from Herbert Enderton's Elements of set theory

Published on 13 Apr 2026 - 21:02

score 110 · Answer 15 · 2026-04-16 15:26:44

110

Views

Determine whether or not $card(A^B)>card(C^D)$?

Published on 16 Apr 2026 - 15:26

List Question

Why do we need classes to list all cardinal numbers?

Is certain function on sets transitive?

$Vld\left(\frac{X = X \cap Y}{X \subseteq Y}\right) true \ or false$

Any order isomorphism $F$ between $\mathcal{P}(A)$ and $\mathcal{P}(B)$ W.R.T. $\subseteq$ must be $F:X\mapsto\{f(x)\mid x\in X\}$ for some $f:A\to B$

I have a maths question suggesting that it is possible to draw a venn diagram where $A \cup C \ne C$ and $A \cup C \ne A$

Equivalence Relations Reasoning

What is the subset that makes the function bijective?

Prove that the function f(x,y) = x - y is not a bijection.

Determining the size of subsets.

Show that the quadratic congruence $x^2+x+1≡0$ (mod p) has an integer solution iff -3 is a QR modulo p.

Give a mathematical derivation of the formula by appealing to probability axioms or set operation rules

How to define addition on the naturals as a function rather than with the successor "function".

Equivalence Relations without Equality

Infinite cartesian product from Herbert Enderton's Elements of set theory

Determine whether or not $card(A^B)>card(C^D)$?

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