Jens Reinhold's user avatar
Jens Reinhold's user avatar
Jens Reinhold's user avatar
Jens Reinhold
  • Member for 11 years, 10 months
  • Last seen this week
67 votes

Independent evidence for the classification of topological 4-manifolds?

39 votes

Non-homeomorphic spaces that have continuous bijections between them

21 votes
Accepted

Is there a concrete description of the nontorsion elements in the homotopy groups of spheres?

18 votes

Homotopy groups of Diff(X) and Homeo(X)

18 votes
Accepted

What is known about exotic spheres up to stable diffeomorphism?

16 votes

Finite CW complex with finite non-abelian fundamental group and higher homologies zero

14 votes
Accepted

Homotopy groups $\pi_{4n-1}(SO(4n))$

13 votes
Accepted

About the cohomology of $BG^\delta$. Making a Lie group discrete

12 votes
Accepted

Generalize Wu formula to integral cohomology classes

11 votes

SO(3) action on (simply connected) 6 manifold with discrete fixed point

8 votes
Accepted

3-sphere bundles over 4-sphere bound smooth disc bundles

8 votes

If two smooth manifolds are homeomorphic, then their stable tangent bundles are vector bundle isomorphic

8 votes
Accepted

Why is the mapping class group of a surface with nonempty boundary torsion-free?

8 votes
Accepted

Conditions under which the preimage of a submanifold in nontrivial in homology

7 votes
Accepted

Are all pointed maps of classifying spaces of abelian groups homotopy equivalent to homomorphisms?

6 votes

Normal invariants

6 votes

classifying space of orthogonal groups

6 votes

What does positivity of the first Pontryagin number of a vector bundle tell us?

6 votes
Accepted

comparing homology of a space and homology of the classifying space of its fundamental group

5 votes
Accepted

Oddness of intersection form of surface bundle

4 votes
Accepted

When given degrees generate the cohomology ring of a manifold?

4 votes

Vanishing of characteristic numbers vs vanishing of characteristic classes

4 votes

Can one calculate possible mapping degrees from a connected-sum to another manifold?

4 votes

"Economic" Eilenberg-MacLane topological abelian groups

4 votes
Accepted

cohomology module of unit tangent vector bundles over spheres

4 votes

Building a manifold from a CW complex inductively

4 votes
Accepted

References for properties which are invariant under partition of $\mathbb{Z}$ by a finite number of sets

3 votes

How much do characteristic classes fail to characterize bundles?

3 votes
Accepted

fiber sequence of principal bundles

3 votes

When are principal bundles preserved by colimits?