Skip to main content
1190's user avatar
1190's user avatar
1190's user avatar
1190
  • Member for 11 years, 5 months
  • Last seen more than a month ago
11 votes
1 answer
9k views

Geodesics on torus

10 votes
5 answers
3k views

What is the easy way to calculate the roots of $z^4+4z^3+6z^2+4z$?

8 votes
1 answer
863 views

Möbius transformation in the complex plane.

8 votes
3 answers
395 views

Evaluate $\lim_{n\to\infty}\sum_{k=1}^{n}\frac{k}{n^2+k^2}$ [duplicate]

8 votes
2 answers
2k views

Prove that the Sphere with a Hair in $\mathbb{R} ^{3}$ is not Locally Euclidean at q, hence it can not be a Topological Manifold.

8 votes
2 answers
30k views

how to calculate the curvature of an ellipse

8 votes
2 answers
185 views

How to obtain $y$

7 votes
1 answer
2k views

Writing a parametrization of the cissoid by using $\theta$

7 votes
1 answer
5k views

Check my answer: $\Bbb Q$ is neither open nor closed

7 votes
1 answer
207 views

Find $\displaystyle \sum_{k=1}^{\infty}\frac{1}{z_k^2}$

7 votes
4 answers
11k views

The complex gamma function

6 votes
1 answer
471 views

Prove or disprove that $f$ is Möbius transformation.

6 votes
3 answers
2k views

how that if $P(\lim \sup A_n) = 1$ then, $P(\bigcup_{n=1}^\infty A_n)=1$

6 votes
1 answer
3k views

Check my answer: Prove that every open set in $\Bbb R^n$ is a countable union of open intervals.

6 votes
2 answers
15k views

Find All Points on a Paraboloid where Tangent Plane is Parallel to a Given Plane

6 votes
5 answers
2k views

How to show that the vector subspaces of $\mathbb{R}^{n}$ are closed in $\mathbb{R}^{n}$?

6 votes
3 answers
418 views

Which books can I study (learn) better the topics about convergence in $\Bbb R^{n}$ and euclidean space?

5 votes
1 answer
2k views

Show that $[fX,gY]= fg[X,Y]+f(Xg)Y−g(Yf)X$.

5 votes
1 answer
3k views

Show that the zero set of $f$ is an orientable submanifold of $\Bbb R^{n+1}$.

5 votes
1 answer
2k views

If $\gamma$ is spherical, then the equation $\frac{\tau}{\kappa}=\frac{d}{ds}(\frac{\dot{\kappa}}{\tau \kappa^2})$ holds.

5 votes
1 answer
471 views

Calculation of sum by using residue theory

5 votes
2 answers
221 views

how can I show this integral diverges?

5 votes
1 answer
2k views

Find $\lim \sup A_n$ and $\lim \inf A_n$?

5 votes
1 answer
367 views

Prove that $\Gamma'(1)=-\gamma$

5 votes
1 answer
861 views

Geodesic eqautions and length of a curve in geodesic coordinate system.

4 votes
1 answer
195 views

Showing to be Unit-sphere

4 votes
1 answer
588 views

Finite order function in the complex analysis.

4 votes
1 answer
316 views

The curve has constant torsion.

4 votes
2 answers
3k views

The double cone is not a surface.

4 votes
1 answer
131 views

A random walk question: what is the given probability?

1
2 3 4 5
12