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Earthliŋ
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23 votes
1 answer
2k views

Non-orientable 3-manifold has infinite fundamental group

10 votes
1 answer
3k views

Structures on torus

9 votes
1 answer
2k views

Radical of $\mathfrak{gl}_n$

9 votes
1 answer
493 views

Polynomial approximation to formal power series matrix

8 votes
1 answer
422 views

Computing Hochschild cohomology of an algebra in GAP

8 votes
1 answer
1k views

Cubic plane curves

8 votes
1 answer
434 views

Can one exchange fibre and base space in a fibre bundle?

8 votes
1 answer
910 views

Why are the integers appearing in lens spaces coprime?

8 votes
3 answers
2k views

Nilpotent Lie group homeomorphic to $\mathbb R^n$?

7 votes
2 answers
637 views

Uniqueness of classifying space

7 votes
1 answer
766 views

Exercise 2.13 in Atiyah-Macdonald

7 votes
0 answers
121 views

Connection in fibre bundle from discontinuous group action

7 votes
0 answers
354 views

How to write holomorphic line bundles on compact Riemann surfaces in coordinates

6 votes
1 answer
208 views

Cohomology of $\mathcal O(k)$

6 votes
1 answer
390 views

$\pi_0$ in the long exact sequence of a fibration and quaternionic projective space

5 votes
0 answers
479 views

All almost complex structures on a manifold

5 votes
0 answers
561 views

Computing the cotangent complex: what's the ring?

5 votes
2 answers
295 views

Set defined by $xy-zw=1$

5 votes
1 answer
343 views

Determine topological properties of a space of matrices

5 votes
1 answer
2k views

Solvable Lie algebra with codimension 1 ideal

5 votes
0 answers
385 views

Chern classes and curvature of total space

5 votes
1 answer
229 views

Algebraic vector bundles which are analytically but not algebraically isomorphic

4 votes
1 answer
174 views

Importance of (category of) injective objects

4 votes
1 answer
474 views

Cohomologies with line bundle vs. coherent coefficients

4 votes
1 answer
574 views

Weight spaces of Verma modules

4 votes
0 answers
221 views

There exists unique $g$ s.t. $g(x) = f(x) + A\int_0^1\sin(x-y)g(y)dy$

4 votes
1 answer
463 views

Relation between moduli of curves and Teichmüller theory

3 votes
1 answer
97 views

Parabolic subgroups and connectedness

3 votes
1 answer
358 views

First examples for topology of non-Hausdorff spaces

3 votes
2 answers
761 views

A proof for Atiyah-Macdonald Exercise I.21.iii