Question

Wrong conclusion on metric space $(X, d)$ where every closed, bounded set is compact

score 54 · Answer 1 · 2023-04-06 17:06:21

54

Views

Wrong conclusion on metric space $(X, d)$ where every closed, bounded set is compact

Published on 06 Apr 2023 - 17:06

score 62 · Answer 2 · 2023-04-11 18:53:55

62

Views

Where is the error in this argument that convergence in probability implies convergence almost surely?

Published on 11 Apr 2023 - 18:53

score 85 · Answer 3 · 2023-04-14 20:59:16

85

Views

Fake proof that all functions are integrable

Published on 14 Apr 2023 - 20:59

score 108 · Answer 4 · 2023-04-16 10:12:36

108

Views

Traps and pitfalls in elementary algebraic manipulation

Published on 16 Apr 2023 - 10:12

score 56 · Answer 5 · 2026-02-24 13:47:23

56

Views

Is the entire field of "membrane computing" vaporware?

Published on 24 Feb 2026 - 13:47

score 74 · Answer 6 · 2023-05-03 12:39:23

74

Views

Confusion about $\mathbb{Z}[x]$ being not a PID and generators of ideals of form $\left(f_1(x), \ldots, f_n(x)\right)$

Published on 03 May 2023 - 12:39

score 36 · Answer 7 · 2023-05-07 16:06:40

36

Views

Find the number of $2$ vs $2$ matches that can be played between $6$ persons such that each team (of two) plays exactly once.

Published on 07 May 2023 - 16:06

score 135 · Answer 8 · 2023-05-10 11:41:17

Let $A_1,A_2,...,A_{18}$ be the vertices of a regular polygon with 18 sides. How many of the triangles $A_iA_jA_k$ are isosceles but not equilateral?

score 82 · Answer 9 · 2026-03-26 02:52:29

82

Views

Euler's constant conundrum

Published on 26 Mar 2026 - 2:52

score 100 · Answer 10 · 2023-05-12 11:55:42

100

Views

According to what rule is $\frac{a+b}{a} = \frac{b}{a+b} = \frac {a+b-b}{a-a-b}=-\frac {a}{b}$ true and why?

Published on 12 May 2023 - 11:55

score 75 · Answer 11 · 2023-05-22 19:48:22

75

Views

Conjugacy classes in alternating group

Published on 22 May 2023 - 19:48

score 233 · Answer 12 · 2023-05-28 20:34:36

233

Views

What are all the restrictions on existential generalization (When CAN'T we use it)?

Published on 28 May 2023 - 20:34

score 36 · Answer 13 · 2023-05-30 13:16:56

36

Views

An argument for any singular cardinal has a closed unbounded subset that contains no cardinals

Published on 30 May 2023 - 13:16

score 71 · Answer 14 · 2023-06-06 07:32:05

71

Views

If $f:X→X$ is a bijection then is $g(x):=\begin{cases}f(x),\,\text{if }x∈Y\\x,\,\text{otherwise}\end{cases}$ with $Y∈\mathcal P(X)$ a bijection too?

Published on 06 Jun 2023 - 7:32

score 80 · Answer 15 · 2023-06-06 15:46:44

80

Views

Where did I go wrong in "proving" that if $\text{rank}(A_{m\times n})=\text{rank}(B_{n\times m})=m$ then $ABA\neq 0$?

Published on 06 Jun 2023 - 15:46

List Question

Wrong conclusion on metric space $(X, d)$ where every closed, bounded set is compact

Where is the error in this argument that convergence in probability implies convergence almost surely?

Fake proof that all functions are integrable

Traps and pitfalls in elementary algebraic manipulation

Is the entire field of "membrane computing" vaporware?

Confusion about $\mathbb{Z}[x]$ being not a PID and generators of ideals of form $\left(f_1(x), \ldots, f_n(x)\right)$

Find the number of $2$ vs $2$ matches that can be played between $6$ persons such that each team (of two) plays exactly once.

Let $A_1,A_2,...,A_{18}$ be the vertices of a regular polygon with 18 sides. How many of the triangles $A_iA_jA_k$ are isosceles but not equilateral?

Euler's constant conundrum

According to what rule is $\frac{a+b}{a} = \frac{b}{a+b} = \frac {a+b-b}{a-a-b}=-\frac {a}{b}$ true and why?

Conjugacy classes in alternating group

What are all the restrictions on existential generalization (When CAN'T we use it)?

An argument for any singular cardinal has a closed unbounded subset that contains no cardinals

If $f:X→X$ is a bijection then is $g(x):=\begin{cases}f(x),\,\text{if }x∈Y\\x,\,\text{otherwise}\end{cases}$ with $Y∈\mathcal P(X)$ a bijection too?

Where did I go wrong in "proving" that if $\text{rank}(A_{m\times n})=\text{rank}(B_{n\times m})=m$ then $ABA\neq 0$?

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