Drinzjeng Triang's user avatar
Drinzjeng Triang's user avatar
Drinzjeng Triang's user avatar
Drinzjeng Triang
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  • Dai-qruan-siengx, Triung-ghrua Njin-mjin gyungh-ghua-kuok
15 votes
1 answer
227 views

When $(-)+M$ sends closed sets to closed sets?

9 votes
0 answers
156 views

Happy New Year! Suppose $H''(r)-aH'(r)=0$ and $H'(0)=\frac{1}{p^2}$. Find the "special solution" for $H'(0)=\frac{H'(0)}{a}\cdot(1+\frac{N}{Y}e^w)$. [closed]

4 votes
3 answers
152 views

Maximum number of $\pm 1$ valued vectors with pairwise negative inner product

3 votes
0 answers
54 views

Does $L^1(\mathbb R)$ implies $\limsup_{n\to\infty} f(nx)<\infty$ for almost every $x\in\mathbb R$?

3 votes
2 answers
151 views

$\lim_{n\to\infty}\{\frac{3}{n}\sum_{k=1}^n[1+8\sin^2(\frac{k\pi}{n})]^{-1}\}^{2^n}$

2 votes
2 answers
1k views

Maximum determinant of a $(0,1)$-matrix [duplicate]

2 votes
1 answer
394 views

How many similar matrices does one given matrix have? [closed]

2 votes
0 answers
28 views

Need an analysis of the "generalized" Prisoners dilemma

2 votes
1 answer
63 views

Length function on Weyl group $S_n$ gives part of the Pascal's triangle

1 vote
0 answers
28 views

Construct a continuous and periodic function for the given sequence.

1 vote
1 answer
104 views

Is $GL_2(\mathbb{C})\cong \hat{\mathbb{C}}\times \mathbb{C}\times \mathbb{C}^*\times \mathbb{C}^*$?

1 vote
1 answer
94 views

Need a proof for a generalized sequence test.

1 vote
0 answers
45 views

Evaluate $\lim_{n\to\infty}\prod_{k=0}^n\cos{\frac{a}{p^k}}$ where $p\in\mathbb{N}$ [duplicate]

0 votes
1 answer
93 views

Evaluate $\int_0^\infty\frac{\sin^4x}{x^2}dx$ with $\int_0^\infty\frac{\sin x}{x}dx=\frac{\pi}{2}$ [duplicate]

0 votes
1 answer
1k views

$\lim_{n\to\infty}(1^n+2^n+…+n^n) /n^n$. [duplicate]

0 votes
0 answers
189 views

Does Dirichlet function contradicts the Lusin's theorem?

-4 votes
1 answer
68 views

How to evaluate$\int_0^\infty\dfrac{x^{-\lambda}}{1+(x+k)^2}dx\text{ , where $\lambda\in(0,1)$ , $k\in(0,+\infty)$}$ [closed]