User Wang Chen - Mathematics Stack Exchange

Wang Chen

Member for 7 years, 1 month
Last seen more than 2 years ago

11 Questions

Score Activity Newest Views

2 votes

1 answer

144 views

Determine whether the series converges uniformly?

asked Apr 8, 2017 at 7:43

2 votes

1 answer

554 views

Abel's theorem and power series

asked Apr 13, 2017 at 12:19

2 votes

5 answers

113 views

Find $\lim_{x \to 0} (\frac {\sin x}{x})^{\frac{1}{\sin^2x}}$

asked Oct 27, 2017 at 3:14

1 vote

2 answers

174 views

$\lim\limits_{x \to a} f(x)=L $ and $\lim\limits_{x \to L} g(x)=M$ implies $\lim\limits_{x \to a} g(f(x))=M$?

asked Jun 8, 2017 at 15:52

1 vote

3 answers

166 views

Find the sum of the series $\sum_{k=1}^\infty \frac{(-1)^{k-1}}{2^kk}$

asked Apr 13, 2017 at 15:56

1 vote

1 answer

586 views

How many ways to distribute the numbers into two groups?

asked Oct 1, 2019 at 8:24

0 votes

1 answer

25 views

Is it possible to find some value of $k$ such that the following inequality hold?

asked May 19, 2020 at 5:14

0 votes

3 answers

52 views

Prove that $|\int_{0}^{1}e^{x^2}dx-\sum_{k=0}^{n-1}\frac{1}{(2k+1)k!}| \leq \frac{3}{n!}$

asked May 1, 2017 at 9:27

0 votes

1 answer

98 views

Proof of metric space [closed]

asked Jun 6, 2017 at 7:03

0 votes

1 answer

275 views

Check whether sets are closed, open, compact or connected

asked Jun 9, 2017 at 7:43

0 votes

1 answer

60 views

Prove that $\left[\sum_{k=0}^n \binom{n}{k}\right]^2 = \sum_{k=0}^{2n} \binom{2n}{k}$ [closed]

asked Sep 26, 2019 at 15:34