Mathematics
Charlie Chang's user avatar
Charlie Chang's user avatar
Charlie Chang's user avatar
Charlie Chang
  • Member for 5 years, 2 months
  • Last seen more than a month ago
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All Questions Answers
Score Newest
question
15
What is exponential map in differential geometry
Jul 23, 2020
question
10
Show $1+\frac{8q}{1-q}+\frac{16q^2}{1+q^2}+\frac{24q^3}{1-q^3}+\dots=1+\frac{8q}{(1-q)^2}+\frac{8q^2}{(1+q^2)^2}+\frac{8q^3}{(1-q^3)^2}+\dots$.
Aug 7, 2020
question
5
Sylow theorem and tetrahedron
Nov 10, 2019
question
4
Convergence of $\sum\frac{\sin n\theta}{n^r}$ and $\sum_{n=1}^\infty u_n \cos (n\theta+a)$.
Aug 11, 2020
question
4
Definition of geodesic not as critical point of length $L_\gamma$ [*] [duplicate]
Jul 27, 2020
question
3
Solve real ode $\ddot x + x = 0$ by introducing $i$?
Oct 12, 2021
question
3
Show that $\sum\frac{(-1)^{n+1}} {{n}^r} \sum\frac{(-1)^{n+1}} {{n}^s} $ by Abel's rule forms a series that doesn't converge when r+s=1.
Aug 11, 2020
question
3
Convergence of $\sum_{n=1}^\infty 2^n\sin\frac{1}{3^nz}$
Aug 10, 2020
question
3
Show that the series $\frac{1} {\sqrt{1}} -\frac{1} {\sqrt{2}} +\frac{1} {\sqrt{3}} +\dots$ converges, and its square (formed by Abel's rule) doesn't.
Aug 10, 2020
question
3
Row sum and column sum of double series $a_{m,n}=\frac{m-n}{2^{m+n}}\frac{(m+n-1)!}{m!n!}$
Aug 8, 2020
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7
Why does MLE tend to normal distribution

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