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HeroZhang001's user avatar
HeroZhang001's user avatar
HeroZhang001
  • Member for 1 year, 7 months
  • Last seen this week
  • Henan, China
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About

Geometry enthusiast~

A master student is currently studying for a Master of Science degree at Beijing Normal University.

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3
A formula resembling the integral mean value on Kähler manifolds
Jun 5
2
Why is the set of singular points of starlike boundary $\Gamma$ closed?
Oct 19, 2023
1
$\operatorname{Hess}r$ is scalar matrix $\implies$ $M$ is isometric to the space form
Apr 14
1
A formula resembling the integral mean value on Kähler manifolds
Jun 9
0
$\operatorname{Hess}r$ is scalar matrix $\implies$ $M$ is isometric to the space form
Apr 18
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9
Use of $\sum_{r=1}^{\infty} \frac{1}{r^2} = \frac{\pi^2}{6} $ in evaluating $I$
8
Assume $\int_0^\infty f(x)dx$ converges. Prove there exists $\xi\in[1,\infty)$ such that $\int_1^\infty \frac{f(x)}x dx=\int_1^\xi f(x)dx$.
6
Is $\{(\mathbb R,\phi)\}$ a smooth atlas for $\mathbb R$, where $\phi(x)=\left\{ \begin{array}{ll} x & x<0, \\ 2x& x\geq0~? \end{array} \right.$
6
Product vs. join of subgroups of a finite group
5
Please tell me why my method of solving $\sin\left(\frac{\pi}{3}-2\,x\right)-\sin\left(6\,x\right)=2$ is not correct.