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seen Nov 12 at 16:53

没什么好说的


Sep
24
awarded  Autobiographer
Jul
2
awarded  Curious
Dec
5
awarded  Yearling
Oct
12
asked What does $e^z,|z|=1$ look like?
Sep
27
accepted How to evaluate $\int_{0}^{\pi} \log(2+\cos x)dx$?
Sep
26
accepted How to prove $\lim_{n\to \infty} \prod_{i=0}^{n-1} $ $(2+\cos \frac{i \pi}{n})^{\frac{\pi}{n}}$=$\sqrt{3}$ by the sum form of a integration?
Sep
26
comment How to evaluate $\int_{0}^{\pi} \log(2+\cos x)dx$?
As it is a trigonometry form. Is it a natural way to think the Euler formula?
Sep
26
comment How to evaluate $\int_{0}^{\pi} \log(2+\cos x)dx$?
Great ! How does the ideal of using $I(a)$ or $ln(\frac{a+a^{-1}}{2}+cosx)$ come out?
Sep
26
revised How to evaluate $\int_{0}^{\pi} \log(2+\cos x)dx$?
added 147 characters in body
Sep
26
revised How to evaluate $\int_{0}^{\pi} \log(2+\cos x)dx$?
added 3 characters in body; edited title
Sep
26
asked How to evaluate $\int_{0}^{\pi} \log(2+\cos x)dx$?
Sep
26
accepted How to compute the number of Sylow p-subgroups of $GL_{n}(F_{p})$ ?
Sep
26
revised How to prove $\lim_{n\to \infty} \prod_{i=0}^{n-1} $ $(2+\cos \frac{i \pi}{n})^{\frac{\pi}{n}}$=$\sqrt{3}$ by the sum form of a integration?
added 87 characters in body
Sep
25
comment How to prove $\lim_{n\to \infty} \prod_{i=0}^{n-1} $ $(2+\cos \frac{i \pi}{n})^{\frac{\pi}{n}}$=$\sqrt{3}$ by the sum form of a integration?
@experimentX The $pi$ is redundant.
Sep
25
revised How to prove $\lim_{n\to \infty} \prod_{i=0}^{n-1} $ $(2+\cos \frac{i \pi}{n})^{\frac{\pi}{n}}$=$\sqrt{3}$ by the sum form of a integration?
added 4 characters in body
Sep
25
comment How to prove $\lim_{n\to \infty} \prod_{i=0}^{n-1} $ $(2+\cos \frac{i \pi}{n})^{\frac{\pi}{n}}$=$\sqrt{3}$ by the sum form of a integration?
@experimentX How do you copmute the integration?
Sep
25
revised How to prove $\lim_{n\to \infty} \prod_{i=0}^{n-1} $ $(2+\cos \frac{i \pi}{n})^{\frac{\pi}{n}}$=$\sqrt{3}$ by the sum form of a integration?
edited title
Sep
25
asked How to prove $\lim_{n\to \infty} \prod_{i=0}^{n-1} $ $(2+\cos \frac{i \pi}{n})^{\frac{\pi}{n}}$=$\sqrt{3}$ by the sum form of a integration?
Sep
23
revised How to compute the number of Sylow p-subgroups of $GL_{n}(F_{p})$ ?
edited tags
Sep
23
comment How to compute the number of Sylow p-subgroups of $GL_{n}(F_{p})$ ?
Thanks.Is the explaination above a basic skill or common sense for matrix group(or linear group) problem ,or just for solving problems of linear algebra about the invariant space ? I have only learned some basic linear algebra for engineering. The method seems to depend on comprehension of linear space and how could a matrix be diagonalizable with its eigenvalues.