Mathematics
Chang's user avatar
Chang's user avatar
Chang's user avatar
Chang
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question
2
Why $u=1$ is not a minimizer of $I(u)=\int_{0}^{1}u^2(2-u)^2dx$?
Jan 9, 2022
question
2
How should I evaluate the average order of $\sigma(n)$?
May 2, 2022
question
2
How could I visualize the plane $\{(x_1,y_1,x_2,y_2)\in\mathbb{R}^4: x_1=y_1-1,x_2=y_2-1\}?$
Jul 7, 2022
question
2
David Williams' Exercise 4.5 $\mathbb{P}(\text{limsup}(\frac{X_n}{\sqrt{2\log{n}}})\leq1)=1$
Sep 5, 2022
question
2
Why does the condition $\sum_{x\in\Lambda}f_x=0$ imply the discrete Laplacian is invertible?
Nov 13, 2022
question
1
How to prove $X_n =e^{aS_n-bn} \to 0$ a.s.(where $S_n$ is the sum of standard normal random variables)? [closed]
Nov 2, 2021
question
1
How to show the equation $ax+by+cz=n$ always have nonnegative solutions?
May 17, 2022
question
0
If $(h,k) = 1$, then $h^{\phi(k)}\equiv 1(\textrm{mod}\ k)$? [duplicate]
Sep 3, 2021
question
0
How to make this series converge?
Nov 27, 2021
question
0
Let n be an odd composite number. If $a\not\in (\mathbb{Z}/n\mathbb{Z})^{*},$ is it possible that $a^{\frac{n-1}{2}}=\pm1$? [closed]
Mar 30, 2022

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