Question

Show that $u=0$ if $N(u)=0$ for $u\in R~,$

score 38 · Answer 1 · 2026-03-17 12:18:28

38

Views

Show that $u=0$ if $N(u)=0$ for $u\in R~,$

Published on 17 Mar 2026 - 12:18

score 292 · Answer 2 · 2026-03-17 16:09:48

292

Views

A non-constructive proof of Hahn decomposition theorem

Published on 17 Mar 2026 - 16:09

score 59 · Answer 3 · 2026-03-19 20:23:43

59

Views

What is wrong with this proof about a sum of binomial coefficients?

Published on 19 Mar 2026 - 20:23

score 62 · Answer 4 · 2026-03-12 05:02:31

62

Views

If $a_{n+1}-\frac{a_n}{2} \to 0$ then $a_n \to 0$

Published on 12 Mar 2026 - 5:02

score 39 · Answer 5 · 2026-03-12 08:20:11

39

Views

Show that $\lim_{n\rightarrow\infty} \frac{1}{x_{n}}=0$ [proof verification]

Published on 12 Mar 2026 - 8:20

score 51 · Answer 6 · 2026-03-22 08:25:19

51

Views

Example of easy calculations with the central limit theorem in higher dimensions

Published on 22 Mar 2026 - 8:25

score 1.6k · Answer 7 · 2026-03-19 22:19:22

1.6k

Views

Proof: If $7\mid 4a$, then $7\mid a$

Published on 19 Mar 2026 - 22:19

score 177 · Answer 8 · 2026-03-22 11:56:22

177

Views

Complex integral involving Cauchy integral formula

Published on 22 Mar 2026 - 11:56

score 118 · Answer 9 · 2026-03-13 15:25:58

118

Views

Is my proof correct that set $A$ is a subset of $f^{-1}[f[A]]?$

Published on 13 Mar 2026 - 15:25

score 100 · Answer 10 · 2026-03-17 21:32:38

100

Views

Somewhat shady way of solving a problem from Baby Rudin

Published on 17 Mar 2026 - 21:32

score 424 · Answer 11 · 2026-03-20 04:58:29

424

Views

Proving whether a matrix is invertible

Published on 20 Mar 2026 - 4:58

score 1.2k · Answer 12 · 2026-03-22 12:55:41

1.2k

Views

Proof check - If two sequences A and B are equivalent, then the first one is a Cauchy sequence if and only if the second one is a Cauchy sequence too

Published on 22 Mar 2026 - 12:55

score 68 · Answer 13 · 2026-03-17 13:30:29

68

Views

Proof verification: showing that $f(x) = \begin{cases}1, & \text{if $x = 0$} \\0,&\text{if $x \ne 0$}\end{cases}$ is Riemann integrable?

Published on 17 Mar 2026 - 13:30

score 225 · Answer 14 · 2026-03-12 07:59:18

225

Views

Discrete Mathematics and Combinatorics, Combinatorial proof via counting dots

Published on 12 Mar 2026 - 7:59

score 1.9k · Answer 15 · 2026-03-13 06:18:50

1.9k

Views

Why is the image of the pre-image of B, a subset of B?

Published on 13 Mar 2026 - 6:18

List Question

Show that $u=0$ if $N(u)=0$ for $u\in R~,$

A non-constructive proof of Hahn decomposition theorem

What is wrong with this proof about a sum of binomial coefficients?

If $a_{n+1}-\frac{a_n}{2} \to 0$ then $a_n \to 0$

Show that $\lim_{n\rightarrow\infty} \frac{1}{x_{n}}=0$ [proof verification]

Example of easy calculations with the central limit theorem in higher dimensions

Proof: If $7\mid 4a$, then $7\mid a$

Complex integral involving Cauchy integral formula

Is my proof correct that set $A$ is a subset of $f^{-1}[f[A]]?$

Somewhat shady way of solving a problem from Baby Rudin

Proving whether a matrix is invertible

Proof check - If two sequences A and B are equivalent, then the first one is a Cauchy sequence if and only if the second one is a Cauchy sequence too

Proof verification: showing that $f(x) = \begin{cases}1, & \text{if $x = 0$} \\0,&\text{if $x \ne 0$}\end{cases}$ is Riemann integrable?

Discrete Mathematics and Combinatorics, Combinatorial proof via counting dots

Why is the image of the pre-image of B, a subset of B?

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