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Antonio Alfieri's user avatar
Antonio Alfieri's user avatar
Antonio Alfieri's user avatar
Antonio Alfieri
  • Member for 9 years, 11 months
  • Last seen more than a month ago
  • Vancouver, BC, Canada
1 vote
Accepted

Given $(f_k)$ a sequence of bounded functions, find subsequence $(x_{n_j})$ of $(x_n)$ such that $(f_k(x_{n_j}))$ is convergent for all $k$.

1 vote

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

1 vote
Accepted

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

2 votes

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

1 vote
Accepted

Matrices with eingenvalue 1 in Zarisky topology

2 votes

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

1 vote
Accepted

Surgery on the unknot - a $D^2$ bundle over $S^2$?

7 votes
Accepted

Going between Heegaard diagrams and framed link diagrams

0 votes
Accepted

Intersection of a complex manifold with 3-sphere again a manifold?

1 vote

Showing that a function is Frechet Differentiable

1 vote

How to calculate the coefficients of finite product $\prod\limits_{i=1}^n{(z^i-1)}$ effectively

2 votes
Accepted

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

3 votes
Accepted

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

2 votes
Accepted

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

1 vote

Connected sum of submanifolds

2 votes

Fundamental Group of a Manifold with a genus G Heegaard Splitting

2 votes
Accepted

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

2 votes
Accepted

What $X$ should be homeomorphic to?

1 vote

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

2 votes
Accepted

genus of moduli space of a riemann surface

1 vote
Accepted

Problem in Milnor's proof of h-cobordism theorem

2 votes

Euler characteristic, simplicial complex and genus.

1 vote
Accepted

Saturated Torus in a Seifert fibered manifold

1 vote
Accepted

Please suggest a Journal to submit my paper on elementary calculus

2 votes

Derivative of norm of vector field

1 vote

Looking for some interesting or significant results from cohomology

3 votes

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

0 votes

Integration over the Haar measure of a compact Lie group preserves smoothness?

1 vote

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

4 votes

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