András Szűcs's user avatar
András Szűcs's user avatar
András Szűcs's user avatar
András Szűcs
  • Member for 10 years, 8 months
  • Last seen more than a month ago
  • Budapest
34 votes

A simple proof that parallelizable oriented closed manifolds are oriented boundaries?

31 votes
Accepted

What is geometrically the Pontryagin class?

17 votes
Accepted

A simple proof that parallelizable oriented closed manifolds are oriented boundaries?

15 votes

Which closed orientable $4$-dimensional manifolds cannot be embedded in $6$-space?

13 votes

third stable homotopy group of spheres via geometry?

12 votes
Accepted

Immersing spaces in $\mathbb{R}^{n+1}$, Stiefel-Whitney classes

8 votes

Can one deform an immersion of a 3-manifold in $\mathbb R^4$ to an embedding in $\mathbb R^6$?

8 votes

Finiteness of stable homotopy groups of spheres

5 votes

Homology of symmetric product

5 votes

How does the cokernel of the J-homomorphism count exotic spheres?

4 votes

Cobordism and finite sheeted covers of manifolds

4 votes

Computation of homotopy groups of spheres via Pontryagin-Thom

4 votes

Realizing a homology by a smooth immersion

3 votes
Accepted

Self-intersection of immersed surfaces and connected sum

3 votes

Cobordism and finite sheeted covers of manifolds

3 votes
Accepted

Stiefel classes and generic sections

2 votes

In knot theory: Benefits of working in $S^3$ instead of $\mathbb{R}^3$?

2 votes

Which sets of Stiefel-Whitney characteristic numbers can be realized as coming from a manifold?

2 votes

Computing a cobordism group of manifolds endowed with a real vector bundle with constraints on the Stiefel-Whitney classes

2 votes

What is geometrically the Pontryagin class?

1 vote

Embedded (framed) cobordisms

1 vote

Embeddings without nonvanishing normal vector fields

1 vote

Realizing cohomology classes by submanifolds

1 vote

Can one give an immersion of exotic sphere $S^7$ in a standard sphere $S^8$ of radius $1$?

1 vote

Multiplicativity of Euler characteristic for non-orientable fibrations

1 vote

Where should I learn about immersion theory?

1 vote
Accepted

Understanding maps from M to R^n, for n>dim M

1 vote

Construction of exotic spheres that do not bound parallelizable manifolds