# 40 Questions

15
16
votes
2
answers
353
views

3
15
votes
4
answers
276
views

3
8
votes
1
answer
95
views

2
8
votes
1
answer
105
views

2
8
votes
3
answers
198
views

6
6
votes
2
answers
145
views

5
6
votes
1
answer
169
views

4
5
votes
3
answers
78
views

3
5
votes
1
answer
73
views

3
5
votes
1
answer
100
views

3
4
votes
0
answers
64
views

### From $\sup_{n\in \mathbb{N}} \left|\int_0^\Lambda e^{nx} f(x) dx \right| < \infty$ to $f\equiv 0$

May 13 at 21:55 Zero 868
2
4
votes
1
answer
59
views

3
4
votes
2
answers
118
views

3
votes
1
answer
88
views

2
3
votes
0
answers
58
views

### How to classify the sets $M$ by their structures?

Apr 5 at 8:35 Zero 868
1
3
votes
2
answers
104
views

2
3
votes
2
answers
116
views

2
3
votes
1
answer
97
views

2
votes
0
answers
24
views

### Can $x^n$ be uniformly approximated by the combination of $x^{k^2}$?

May 1 at 4:08 Zero 868
2
2
votes
0
answers
32
views

### Property of the number of such integer matrices.

Apr 11 at 3:20 Thomas Andrews 132k
4
2
votes
2
answers
63
views

2
2
votes
1
answer
54
views

2
votes
0
answers
55
views

### From $lim_{x \to +\infty} \frac{f(x)}{x^p}$ to $lim_{x \to +\infty} \frac{f'(x)}{px^{p-1}}$?

Dec 30 at 5:37 Kavi Rama Murthy 84.5k

2
votes
2
answers
130
views

3
2
votes
3
answers
118
views

2
votes
1
answer
56
views

1
vote
0
answers
17
views

### An invariant subspace of $\mathcal{A}$ must be the kernel of a commuting linear operator $\mathcal{B}$

May 9 at 18:05 Zero 868

1
vote
1
answer
35
views

1
vote
2
answers
63
views

1
1
vote
0
answers
47
views

### Why does the second derivative of convex function exist almost everywhere?

Dec 24 at 15:01 Zero 868