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Ramiro Hum-Sah
  • Member for 5 years, 9 months
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10 answers
67 votes
14k views
76 bookmarks
Why is the tensor product important when we already have direct and semidirect products?
9 answers
65 votes
4k views
39 bookmarks
Why does $\cos(x) + \cos(y) - \cos(x + y) = 0$ look like an ellipse?
4 answers
52 votes
9k views
37 bookmarks
Intuitive reasoning why are quintics unsolvable
2 answers
44 votes
8k views
45 bookmarks
Is tautological bundle $\mathcal{O}(1)$ or $\mathcal{O}(-1)$?
4 answers
36 votes
9k views
25 bookmarks
Subgroup of $\mathbb{R}$ either dense or has a least positive element?
2 answers
31 votes
5k views
33 bookmarks
How should I think about very ample sheaves?
1 answer
24 votes
2k views
17 bookmarks
Topological vs. Algebraic $K$-Theory
2 answers
23 votes
7k views
21 bookmarks
Unit sphere in $\mathbb{R}^\infty$ is contractible?
3 answers
21 votes
808 views
9 bookmarks
What's the minimum number of $2$s needed to write a positive integer?
1 answer
17 votes
2k views
12 bookmarks
Proving that given any two points in a connected manifold, there exists a diffeomorphism taking one to the other
1 answer
8 votes
431 views
6 bookmarks
Construction of noncommutative torus
2 answers
6 votes
256 views
4 bookmarks
Can anyone explain a compact set intuitive way?
1 answer
5 votes
148 views
3 bookmarks
Connection of $\mathcal{O}(n)$ on a toric manifold
1 answer
4 votes
584 views
2 bookmarks
What is the Newton polyhedron of a toric variety?
3 answers
4 votes
5k views
8 bookmarks
Euler characteristic of an $n$-sphere is $1 + (-1)^n$.
1 answer
4 votes
258 views
4 bookmarks
Global sections of holomorphic line bundles $\mathcal{O}(n)$ over $\mathbb{P}^1(\mathbb{C})$
1 answer
2 votes
69 views
2 bookmarks
CY 3-folds are $T^2 \times \mathbb{R}$ fibrations over the base $\mathbb{R}^3$. What does it mean?
1 answer
1 vote
382 views
1 bookmarks
Prove or disprove: the maximum weight spanning trees form the bases of a matroid.