185

Answers
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33
How can there be topological 4-manifolds with no differentiable structure?
32
Homomorphism from $\hat{\mathbb{Z}}$ to $\mathbb{Z}$
27
Total spaces of $TS^2$ and $S^2 \times R^2$ not homeomorphic
26
Spectral sequences: opening the black box slowly with an example (2)
23
Is there a classification of open subsets of euclidean space up to homeomorphism?
23
How misleading is it to regard $\frac{dy}{dx}$ as a fraction?
21
$S^n \to S^m \to B$ bundle: possible?
20
Does $\pi_1$ have a right adjoint?
20
Stable homotopy category and the moduli space of formal groups
19
Most memorable titles
19
Is it true that all real projective space $RP^n$ can not be smoothly embedded in $R^{n+1}$ for n >1
18
Why don’t more mathematicians improve Wikipedia articles?
18
Example of a compact homogeneous metric space which is not a manifold
17
Duals and Tensor products
16
Level of detail on a Phd application
15
De Rham cohomology of formal groups
14
Which cohomology theories are real- and complex-orientable?
14
Why not define triangulated categories using a mapping cone functor?
14
Proving that a function’s image contains (1/n,…,1/n)
14
How is the differential in complex cobordism defined?
14
Signs and functoriality of tensor products
14
A homotopyish Landweber exact functor theorem
13
Trivial cobordism group in dimensions 1, 3, 7 related to H-space structures on the spheres in these dimensions?
13
determinant of exterior power
13
manifold with given rational homology
13
Increasing union of contractible CW complexes
13
Abstract nonsense attribution
13
Is every real n-manifold isomorphic to a quotient of $\mathbb{R}^n$?
12
Isomorphism between two universal p-typical formal group laws
12
What facts in commutative algebra fail miserably for simplicial commutative rings, even up to homotopy?
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