David C's user avatar
David C's user avatar
David C's user avatar
David C
  • Member for 11 years, 3 months
  • Last seen this week
35 votes
Accepted

Non-stably trivial bundle with trivial characteristic classes

28 votes
Accepted

Simply connected finite CW-complex with only finitely many nontrivial homotopy and homology groups

23 votes

Solving algebraic problems with topology

21 votes

Cobordism of orbifolds?

20 votes

What are examples when the equality of some invariants is good enough in algebraic topology?

19 votes
Accepted

When does the free loop space fibration split?

18 votes

Is there a "geometric" intuition underlying the notion of normal varieties?

18 votes
Accepted

A question on connected sum of compact manifolds

16 votes
Accepted

Categorification of determinant

15 votes

Does every (co)homology functor (in particular, stable homotopy) factor through chain complexes?

15 votes

Motivation for equivariant homotopy theory?

14 votes

How to get convinced that there are a lot of 3-manifolds?

14 votes

Topological Conformal Field Theories.

14 votes

On model categories where every object is bifibrant

13 votes
Accepted

Why is a Kummer surface simply-connected?

13 votes

Pullback map in homology

13 votes

Geometric interpretation of the conjugation operation in the dual Steenrod algebra

11 votes
Accepted

vector bundles associated to a covering space

11 votes

Explicit computations of the étale homotopy type?

11 votes

Lambda-operations on stable homotopy groups of spheres

11 votes
Accepted

What manifolds can have a (non-piecewise) linear structure?

11 votes

Homotopy groups of Moore spaces

11 votes
Accepted

A topological group which is also a (not necessarily smooth) manifold is orientable

10 votes
Accepted

Source request for $H^*(B\mathrm{TOP},\mathbb{Q}) \cong H^*(BO,\mathbb{Q})$

10 votes

Relationships between homology maps of cobordant manifolds

9 votes
Accepted

Smale's theorem for $C^1$ diffeomorphisms of the sphere

9 votes

Any real algebraic variety is diffeomorphic to a real algebraic variety defined over $\mathbb{Q}$

9 votes

Top integer homology of compact analytic variety

9 votes

Homology of symmetric product

9 votes

Topology of algebraic varieties