User Dan Asimov - Mathematics Stack Exchange

11 votes

Is it possible to obtain a sphere from a quotient of a torus?

answered Aug 3, 2015 at 18:19

9 votes

Geometric interpretation of symmetries of a manifold

answered Apr 9, 2021 at 1:32

5 votes

Is any foliation on a 2-torus induced by a suitable flow?

answered Jan 7, 2013 at 22:42

5 votes

Surface Element in Spherical Coordinates

answered Jul 18, 2014 at 0:06

3 votes

a function with differentiable partial derivatives but unequal mixed derivatives

answered Jul 11, 2015 at 0:53

3 votes

Accepted

Intuition behind homology of a Klein bottle

answered Jul 21, 2021 at 0:26

3 votes

Visualize why the group of isometries of the sphere $S^2$ is $S^3/(\mathbf{Z}/2) ?$

answered Sep 8, 2021 at 18:05

3 votes

Elementary proof of the fact that any orientable 3-manifold is parallelizable

answered Jun 11, 2020 at 0:34

3 votes

Accepted

Do I have to prove the base case in the baseless version of strong induction?

answered Nov 3, 2021 at 1:23

3 votes

Proving that no mapping of a set into its power set can be surjective

answered Jul 7, 2023 at 15:40

3 votes

Accepted

Are paths with same image homotopic?

answered Jul 7, 2023 at 16:02

2 votes

Accepted

Why codomain is more than the range in an Inverse function

answered Jul 10, 2023 at 1:19

2 votes

Examples of compact sets that are infinite dimensional and not bounded

answered Sep 7, 2021 at 18:06

2 votes

Topological group needs to be path connected

answered May 9, 2020 at 1:48

1 vote

For a closed, regular space curve of length $\ell$, show that $\int_0^\ell\kappa(s)ds\geq 2\pi$, where $\kappa$ gives curvature

answered May 9, 2020 at 3:03

1 vote

On the transitivity of the group of automorphisms of a Riemann surface

answered Jul 8, 2019 at 20:03

1 vote

How to prove that the following function is continuous at irrational numbers?

answered Sep 10, 2021 at 6:46

1 vote

Everyone casts a vote at random, probability someone gets a majority of votes

answered Sep 3, 2021 at 17:03

1 vote

A name for convex polyhedra with regular polygons as faces

answered Jul 11, 2023 at 23:52

1 vote

Continuous surjection from plane to closed unit interval such that preimage of each point is bounded

answered Jul 25, 2023 at 20:39

1 vote

Uniformly Sampling from a High-Dimensional Unit Sphere

answered May 23, 2023 at 18:23

0 votes

Why does $\vec \nabla \times \vec F=0 $ mean that $\exists \Phi: \nabla \Phi=\vec F$?

answered Jun 1, 2023 at 22:25

0 votes

Is this cartesian product defined $ \{0, 1\}^1 $

answered Sep 30, 2021 at 1:10

0 votes

Is the hyperbolic plane the only simply connected hyperbolic 2-manifold?

answered May 31, 2020 at 18:26

0 votes

mapping class group of the real projective plane

answered Oct 20, 2020 at 21:03

0 votes

Solving for x: finite Maclaurin series = finite Laurent series

answered Jun 17, 2022 at 16:07

0 votes

Area of a Spherical Triangle from Side Lengths

answered Jun 5, 2020 at 19:32

-1 votes

$f(z)$ is analytic in the unit circle - can you prove it's a constant function?

answered Jun 16, 2022 at 23:16

-2 votes

Understanding why $X''(s).X'(s)=0$ where $X$ is parametrized with respect to arc length.

answered Apr 4, 2023 at 19:52

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29 Answers

Is it possible to obtain a sphere from a quotient of a torus?

Geometric interpretation of symmetries of a manifold

Is any foliation on a 2-torus induced by a suitable flow?

Surface Element in Spherical Coordinates

a function with differentiable partial derivatives but unequal mixed derivatives

Intuition behind homology of a Klein bottle

Visualize why the group of isometries of the sphere $S^2$ is $S^3/(\mathbf{Z}/2) ?$

Elementary proof of the fact that any orientable 3-manifold is parallelizable

Do I have to prove the base case in the baseless version of strong induction?

Proving that no mapping of a set into its power set can be surjective

Are paths with same image homotopic?

Why codomain is more than the range in an Inverse function

Examples of compact sets that are infinite dimensional and not bounded

Topological group needs to be path connected

For a closed, regular space curve of length $\ell$, show that $\int_0^\ell\kappa(s)ds\geq 2\pi$, where $\kappa$ gives curvature

On the transitivity of the group of automorphisms of a Riemann surface

How to prove that the following function is continuous at irrational numbers?

Everyone casts a vote at random, probability someone gets a majority of votes

A name for convex polyhedra with regular polygons as faces

Continuous surjection from plane to closed unit interval such that preimage of each point is bounded

Uniformly Sampling from a High-Dimensional Unit Sphere

Why does $\vec \nabla \times \vec F=0 $ mean that $\exists \Phi: \nabla \Phi=\vec F$?

Is this cartesian product defined $ \{0, 1\}^1 $

Is the hyperbolic plane the only simply connected hyperbolic 2-manifold?

mapping class group of the real projective plane

Solving for x: finite Maclaurin series = finite Laurent series

Area of a Spherical Triangle from Side Lengths

$f(z)$ is analytic in the unit circle - can you prove it's a constant function?

Understanding why $X''(s).X'(s)=0$ where $X$ is parametrized with respect to arc length.