144

Answers
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64
Parallelizability of the Milnor’s exotic spheres in dimension 7
52
Proofs that require fundamentally new ways of thinking
30
Books you would like to read (if somebody would just write them…)
30
Are infinite dimensional constructions needed to prove finite dimensional results?
26
Is there a sheaf theoretical characterization of a differentiable manifold?
20
How does the group algebra look as a Lie algebra
19
What is the intuition behind the Freudenthal suspension theorem
18
Non-vanishing of group cohomology in sufficiently high degree
17
Euler characteristic of orbifolds
17
Awfully sophisticated proof for simple facts (2)
17
PDEs as a tool in other domains in mathematics (2)
16
Manifolds with prescribed fundamental group and finitely many trivial homotopy groups
14
Mysterious property of $\mathbb{Q}$
14
Vanishing of $\hat{A}$ genus and positive scalar curvature
14
Deformations of semisimple Lie algebras
13
Is there a map of spectra implementing the Thom isomorphism?
13
What are “good” examples of spin manifolds?
13
Eilenberg-Mazur swindle for higher K groups
12
What is the role of equivariance in the Atiyah-Singer index theorem?
12
What kind of spectral sequences come from double complexes?
12
Relation between groups and classifying spaces
12
Looking for a simple proof that R^2 has only one smooth structure
11
What is the best way to study Rational Homotopy Theory
11
List of Classifying Spaces and Covers (2)
11
Is there a Chern-Gauss-Bonnet theorem for orbifolds?
11
Spaces with same homotopy and homology groups that are not homotopy equivalent?
11
Universal property of the tangent bundle
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Number of spin structures
11
Third bordism group of BG, where G is an arbitrary compact Lie group.
10
Coefficients in cohomology
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