Bombyx mori's user avatar
Bombyx mori's user avatar
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Bombyx mori
  • Member for 11 years, 11 months
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111 votes
3 answers
8k views

Grothendieck 's question - any update?

70 votes
2 answers
40k views

When does L' Hopital's rule fail?

39 votes
7 answers
3k views

How to tell $i$ from $-i$?

28 votes
1 answer
5k views

The Taylor expansion of the metric at the origin in geodesic coordinates

19 votes
8 answers
18k views

Why we need to know how to solve a quadratic?

15 votes
1 answer
1k views

How should I prove the duality?

11 votes
1 answer
294 views

Why base point makes a huge difference?

11 votes
2 answers
634 views

How to show $\mathbb{Q}(\alpha^{4})=\mathbb{Q}(\alpha)$?

11 votes
3 answers
884 views

Why this proof $0=1$ is wrong?(breakfast joke)

11 votes
0 answers
832 views

How strong is the statement that Thompson F is amenable?

11 votes
1 answer
2k views

How to show $e^{x}\cos[e^x]$ is a tempered distribution?

10 votes
3 answers
16k views

How to evaluate the derivatives of matrix inverse?

10 votes
1 answer
240 views

How to bound this integral?

10 votes
1 answer
4k views

Tensor product of reduced $k$-algebras must be reduced?

10 votes
3 answers
2k views

How do I prove $f=0$ almost everywhere?

9 votes
1 answer
706 views

How we do actually compute the topological index in Atiyah-Singer?

9 votes
1 answer
1k views

How to show $\mathbb{CP}^{2}\#\overline{\mathbb{CP}^{2}}\not\cong \mathbb{S}^{2}\times \mathbb{S}^{2}$?

9 votes
1 answer
5k views

How to classify 3-sheeted covering space for $S_{1}\vee S_{1}$?

8 votes
1 answer
664 views

Confusion on Cech cohomology

8 votes
0 answers
228 views

How difficult is it to impose a differential structure on a fractal?

8 votes
2 answers
7k views

Is every finitely generated module Noetherian?

8 votes
2 answers
3k views

How to endow topology on a finite dimensional topological vector space?

8 votes
1 answer
628 views

When is Hardy's inequality a strict inequality?

8 votes
3 answers
945 views

When is $V=U\oplus U^{\perp}$?

8 votes
2 answers
1k views

Is it possible to deduce Godel's first incompleteness theorem from Chaitin's incompleteness theorem?

7 votes
0 answers
322 views

How to parallel transport a coframe field in a geodesic normal neighborhood?

7 votes
3 answers
2k views

Can the natural number have an uncountable set of subsets?

7 votes
4 answers
991 views

How should I grade my students?

7 votes
0 answers
272 views

How to classify principal bundles over a 2 dimensional surface?

7 votes
1 answer
376 views

What has projectiveness to do with Cohen-Macaulay rings?

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