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Daniel Valenzuela's user avatar
Daniel Valenzuela's user avatar
Daniel Valenzuela's user avatar
Daniel Valenzuela
  • Member for 10 years
  • Last seen more than 3 years ago
13 votes
Accepted

Codimension 1 homology represented by Embedded Submanifold

11 votes
Accepted

Two point topological space

11 votes
Accepted

Why can we always take the zero section of a vector bundle?

9 votes
Accepted

Quotient spaces $SO(3)/SO(2)$ and $SO(3)/O(2)$

8 votes
Accepted

A map which is trivial on homology but not on cohomology?

8 votes
Accepted

What closed 3-manifolds have fundamental group $\Bbb Z$?

7 votes

Is $\mathbb{R}^n$ properly homotopy equivalent to $\mathbb{R}^m$ if $n \neq m$?

7 votes

Having difficulties showing the triangle inequality of metric in the plane

6 votes
Accepted

Module tensor product of an element with zero

6 votes
Accepted

homology of suspension

6 votes
Accepted

How to show the covering space of an orientable manifold is orientable

5 votes
Accepted

Tensor product of flat real line bundles and triviality.

5 votes

How do I draw this weird space

5 votes

examples of linear map $f:V \rightarrow V$, which is injective but not surjective

5 votes
Accepted

Why "singular" in "singular homology/cohomology"?

5 votes
Accepted

Geometric intuition for homotopy invariance of fiber bundles?

5 votes
Accepted

$[X,Y]$ is finite where $X$ is finite connected CW-complex, and $Y$ has finite homotopy groups

4 votes
Accepted

Find a nontrivial bundle of $S^1$ with fibre isomorphic to $\mathbb{R}^n$

4 votes

Examples of group-theoretic results more easily obtained through topology or geometry

4 votes
Accepted

Another clarification about Thom-Pontrjagin construction

4 votes

Grassmanians and boudaries of manifolds

4 votes

Cornered sphere homemorphic to unit sphere

4 votes

Which of these sets is bigger?

4 votes

Homotopy groups of a wedge sum

4 votes

retraction induced homomorphism is surjective

4 votes
Accepted

A complex line bundle is trivial if and only if the first Chern class is zero

4 votes

What's the "easiest" closed 3-manifold with a nonabelian fundamental group?

4 votes

Description of real projective space $P^3$

4 votes
Accepted

Show that for a degree 1 map $f: M \rightarrow N$ the induced map $f_*: H_1(M) \rightarrow H_1(N)$ is a surjection

4 votes
Accepted

Understanding the Homotopy Invariance of Fiber Bundle

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