Question

Times when you want $(\cdot)^2$ and not $|\cdot|^2$ when porting from $\mathbb{R}$ to $\mathbb{C}$

score 222 · Answer 1 · 2026-03-29 06:02:17

222

Views

Times when you want $(\cdot)^2$ and not $|\cdot|^2$ when porting from $\mathbb{R}$ to $\mathbb{C}$

Published on 29 Mar 2026 - 6:02

score 39 · Answer 2 · 2023-10-11 10:30:20

39

Views

Examples of functions with special superdifferential and subdifferential.

Published on 11 Oct 2023 - 10:30

score 175 · Answer 3 · 2023-10-13 16:31:25

175

Views

Is a finitely additive measure with countably additive marginals countably additive?

Published on 13 Oct 2023 - 16:31

score 122 · Answer 4 · 2023-10-15 04:30:13

122

Views

Prove that $3^n+2$ is not a prime for all $n\ge 0$, $n$ is a whole number.

Published on 15 Oct 2023 - 4:30

score 265 · Answer 5 · 2023-10-16 13:14:33

265

Views

Does there exist $( x_n)_{n\in\mathbb{N}}\subset \mathbb{R}$ such that $\sum_{k=1}^{\infty} x_{kn} =1$ for every $n\in\mathbb{N}?$

Published on 16 Oct 2023 - 13:14

score 47 · Answer 6 · 2023-10-16 16:23:17

47

Views

Question about transient states in markov chain

Published on 16 Oct 2023 - 16:23

score 104 · Answer 7 · 2023-10-19 15:47:48

104

Views

$\sum a_n$ diverges $\iff$ for every $(b_n)\subset\mathbb{R}$ s.t. $\sum b_na_n$ diverges, $\sum b_na_{n+1}$ diverges also, and related questions

Published on 19 Oct 2023 - 15:47

score 43 · Answer 8 · 2026-04-03 16:47:17

43

Views

If $\mathcal U\ast\mathcal V$ is transitive then are $\mathcal U$ and $\mathcal V$ always transitive?

Published on 03 Apr 2026 - 16:47

score 37 · Answer 9 · 2023-10-20 05:45:27

37

Views

Explicit example of a discontinuous function between convergence spaces with the preimage of every open set open

Published on 20 Oct 2023 - 5:45

score 37 · Answer 10 · 2023-10-20 16:43:52

37

Views

Examples of Differentiable function with only a few discontinuous partial derivatives

Published on 20 Oct 2023 - 16:43

score 72 · Answer 11 · 2026-03-28 17:40:30

72

Views

Similar short exact sequences where the first abelian group is different

Published on 28 Mar 2026 - 17:40

score 139 · Answer 12 · 2023-10-24 09:53:06

139

Views

Is there an injection $f:\mathbb{R}\to\mathbb{R}$ that is unbounded on every interval?

Published on 24 Oct 2023 - 9:53

score 20 · Answer 13 · 2026-03-25 14:05:28

20

Views

counter-example for quotient of artinian and noetherian modules

Published on 25 Mar 2026 - 14:05

score 64 · Answer 14 · 2023-10-28 07:32:00

64

Views

Counterexample for statement: $2$ is always a valid subobject classifier

Published on 28 Oct 2023 - 7:32

score 33 · Answer 15 · 2026-03-26 02:47:36

33

Views

If $X \perp Y$ and $X \perp Y | Z$ , is that true that $X \perp Z$ or $Y \perp Z$ if $X$ and $Y$ can take 3 values but $Z$ only takes two.

Published on 26 Mar 2026 - 2:47

List Question

Times when you want $(\cdot)^2$ and not $|\cdot|^2$ when porting from $\mathbb{R}$ to $\mathbb{C}$

Examples of functions with special superdifferential and subdifferential.

Is a finitely additive measure with countably additive marginals countably additive?

Prove that $3^n+2$ is not a prime for all $n\ge 0$, $n$ is a whole number.

Does there exist $( x_n)_{n\in\mathbb{N}}\subset \mathbb{R}$ such that $\sum_{k=1}^{\infty} x_{kn} =1$ for every $n\in\mathbb{N}?$

Question about transient states in markov chain

$\sum a_n$ diverges $\iff$ for every $(b_n)\subset\mathbb{R}$ s.t. $\sum b_na_n$ diverges, $\sum b_na_{n+1}$ diverges also, and related questions

If $\mathcal U\ast\mathcal V$ is transitive then are $\mathcal U$ and $\mathcal V$ always transitive?

Explicit example of a discontinuous function between convergence spaces with the preimage of every open set open

Examples of Differentiable function with only a few discontinuous partial derivatives

Similar short exact sequences where the first abelian group is different

Is there an injection $f:\mathbb{R}\to\mathbb{R}$ that is unbounded on every interval?

counter-example for quotient of artinian and noetherian modules

Counterexample for statement: $2$ is always a valid subobject classifier

If $X \perp Y$ and $X \perp Y | Z$ , is that true that $X \perp Z$ or $Y \perp Z$ if $X$ and $Y$ can take 3 values but $Z$ only takes two.

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