Question

$f$ is continuous on $\mathbb R -\{0\}$, but cannot be made into a continuous function by change on a set of measure zero.

score 53 · Answer 1 · 2018-11-27 15:19:03

53

Views

$f$ is continuous on $\mathbb R -\{0\}$, but cannot be made into a continuous function by change on a set of measure zero.

Published on 27 Nov 2018 - 15:19

score 70 · Answer 2 · 2018-11-28 12:11:11

70

Views

Alternative proof for $ \sum \left(\frac{k-2}{k}\right)^k$ is divergent.

Published on 28 Nov 2018 - 12:11

score 74 · Answer 3 · 2018-11-29 21:50:49

74

Views

divergence of $\sum_{n=3}^\infty \frac{\sqrt{n}+2}{n-2}$ verification/ alternative method

Published on 29 Nov 2018 - 21:50

score 51 · Answer 4 · 2018-12-02 13:28:14

51

Views

If $|c_k| \leq k^2 $ does $\sum \frac{(-2)^k +c_k^3}{3^k }$ converge?

Published on 02 Dec 2018 - 13:28

score 295 · Answer 5 · 2018-12-02 21:29:38

295

Views

Prove that $\sum_{n=0}^{\infty}\frac{\Gamma^2(n+1)}{\Gamma(2n+2)}=\frac{2\pi}{3^{3/2}}$

Published on 02 Dec 2018 - 21:29

score 261 · Answer 6 · 2026-03-25 01:29:08

261

Views

"Natural" proof of $P\left(\frac{d}{dx}\right)\bigl(e^{xy}Q(x)\bigr)=Q\left(\frac{d}{dy}\right)\bigl(e^{xy}P(y)\bigr)$.

Published on 25 Mar 2026 - 1:29

score 333 · Answer 7 · 2018-12-03 17:29:24

333

Views

Prove $\int_0^1\frac{\log(t^2-t+1)}{t^2-t}\mathrm dt=\frac{\pi^2}9$

Published on 03 Dec 2018 - 17:29

score 100 · Answer 8 · 2026-03-26 04:51:53

100

Views

What's the better proof for $|a| - |b|$ $\leq$ $|a - b|$

Published on 26 Mar 2026 - 4:51

score 84 · Answer 9 · 2026-03-25 23:58:41

84

Views

closed form for $\sum_{n\geq1}\pi n\log\frac{4n+1}{4n-1}\prod_{k\geq1\\k\neq n}\frac{k^2}{k^2-n^2}$?

Published on 25 Mar 2026 - 23:58

score 69 · Answer 10 · 2018-12-05 12:27:49

69

Views

Alternative ways to determine the centre of $GL_n(K)$

Published on 05 Dec 2018 - 12:27

score 487 · Answer 11 · 2018-12-05 19:50:07

487

Views

Is there a clever way to find the units of the quotient ring $\mathbb{Z}_6[x]/\langle x^2+2x\rangle$?

Published on 05 Dec 2018 - 19:50

score 759 · Answer 12 · 2026-03-26 09:39:21

759

Views

Invertible linear operator with diagonalizable power is diagonalizable

Published on 26 Mar 2026 - 9:39

score 167 · Answer 13 · 2026-03-26 04:36:44

167

Views

Shortest way to find the centralizer and normalizer of $A=\{1,s,r^2,sr^2\}\subseteq D_8$?

Published on 26 Mar 2026 - 4:36

score 71 · Answer 14 · 2018-12-09 05:44:24

71

Views

Let $A$ be $10 \times 10$ real matrix. then which of the following is correct?

Published on 09 Dec 2018 - 5:44

score 37 · Answer 15 · 2018-12-09 07:52:06

37

Views

Check if $\sup\left\{\int_J|f(x)|\chi_B(x)\, dx:\lambda(B)\le1/k\right\}\to 0$

Published on 09 Dec 2018 - 7:52

List Question

$f$ is continuous on $\mathbb R -\{0\}$, but cannot be made into a continuous function by change on a set of measure zero.

Alternative proof for $ \sum \left(\frac{k-2}{k}\right)^k$ is divergent.

divergence of $\sum_{n=3}^\infty \frac{\sqrt{n}+2}{n-2}$ verification/ alternative method

If $|c_k| \leq k^2 $ does $\sum \frac{(-2)^k +c_k^3}{3^k }$ converge?

Prove that $\sum_{n=0}^{\infty}\frac{\Gamma^2(n+1)}{\Gamma(2n+2)}=\frac{2\pi}{3^{3/2}}$

"Natural" proof of $P\left(\frac{d}{dx}\right)\bigl(e^{xy}Q(x)\bigr)=Q\left(\frac{d}{dy}\right)\bigl(e^{xy}P(y)\bigr)$.

Prove $\int_0^1\frac{\log(t^2-t+1)}{t^2-t}\mathrm dt=\frac{\pi^2}9$

What's the better proof for $|a| - |b|$ $\leq$ $|a - b|$

closed form for $\sum_{n\geq1}\pi n\log\frac{4n+1}{4n-1}\prod_{k\geq1\\k\neq n}\frac{k^2}{k^2-n^2}$?

Alternative ways to determine the centre of $GL_n(K)$

Is there a clever way to find the units of the quotient ring $\mathbb{Z}_6[x]/\langle x^2+2x\rangle$?

Invertible linear operator with diagonalizable power is diagonalizable

Shortest way to find the centralizer and normalizer of $A=\{1,s,r^2,sr^2\}\subseteq D_8$?

Let $A$ be $10 \times 10$ real matrix. then which of the following is correct?

Check if $\sup\left\{\int_J|f(x)|\chi_B(x)\, dx:\lambda(B)\le1/k\right\}\to 0$

Trending Questions

Popular # Hahtags

Popular Questions