Skip to main content
Antonio Alfieri's user avatar
Antonio Alfieri's user avatar
Antonio Alfieri's user avatar
Antonio Alfieri
  • Member for 9 years, 8 months
  • Last seen more than a month ago
  • Vancouver, BC, Canada
7 votes
Accepted

How to prove that there are only two kinds of 1-dim manifolds without boundary

7 votes
Accepted

Going between Heegaard diagrams and framed link diagrams

4 votes

Fixed-point free map of the 2-sphere which has order 4

4 votes

Presentation of Fundamental Group for a Seifert Fibred Space

3 votes
Accepted

Let $V$ be a $K$-vector space, $f: V \rightarrow V$ a linear map. Under some condition, show that $v, f(v),...,f^n(v)$ are linearly independent.

3 votes

If $\int_M \omega=0\Rightarrow \omega=d\varphi$, then $H^n_c(M)\simeq\mathbb{R}$? ($M$ is a connected orientable manifold)

3 votes

Calculate the fundamental group of a subspace of $\mathbb R^3$, $S^3$ and $\mathbb P^3(\mathbb R)$

3 votes
Accepted

What does a linear map induce on cohomology rings of associated projective spaces?

2 votes
Accepted

Linking pairing in 3-manifolds. Why is it defined in the torsion homology?

2 votes

Fundamental Group of a Manifold with a genus G Heegaard Splitting

2 votes
Accepted

What $X$ should be homeomorphic to?

2 votes
Accepted

$\pi_2(X)$ defined with closed surfaces instead of spheres

2 votes
Accepted

Fundamental group of the following subspace of $\mathbb{C}\times\mathbb{C}$

2 votes

Prove $B^{-1}=I+B-B^2$

2 votes

Give an example of subset $B$ of the real line $\mathbb{R}$ so the subsets $A$, $Int(A)$, $\overline{A}$, dont intersect

2 votes

Derivative of norm of vector field

2 votes

Euler characteristic, simplicial complex and genus.

2 votes
Accepted

genus of moduli space of a riemann surface

1 vote

How does a surjection from $\pi_1(\Sigma_g)$ to a group $Q$ determine an element of $H_2(Q,\mathbb{Z})$?

1 vote
Accepted

Saturated Torus in a Seifert fibered manifold

1 vote
Accepted

Problem in Milnor's proof of h-cobordism theorem

1 vote
Accepted

Please suggest a Journal to submit my paper on elementary calculus

1 vote

Looking for some interesting or significant results from cohomology

1 vote

How to know whether a contact form is only defined locally or globally?

1 vote
Accepted

When does $\pi_1(\Sigma)$ inject into $\pi_1(S^3 \setminus \Sigma)$?

1 vote

Why the lens space L(2,1) is homeomorphic to $\mathbb{R}P^3$?

1 vote

One-parameter subgroups and Lie bracket

1 vote

Self study plan

1 vote
Accepted

A space obtained by $S^3$ by removing a Hopf link

1 vote

Prove $\left(\frac{1+\cos2\theta+i\sin2\theta}{1+\cos2\theta-i\sin2\theta}\right)^n = \cos2n\theta+i\sin2n\theta$