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I am an engineer who is in love with math and lifelong math student. I love to learn new things in mathematics for self-satisfaction. My idols are Gauss , Euler , Ramanujan because they were in love with math as I feel.


Sep
27
revised $\frac{\pi}{4}=k\arctan \frac{1}{m}+l\arctan \frac{1}{n}$ has only four solutions?
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Sep
27
revised $\frac{\pi}{4}=k\arctan \frac{1}{m}+l\arctan \frac{1}{n}$ has only four solutions?
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Sep
27
answered $\frac{\pi}{4}=k\arctan \frac{1}{m}+l\arctan \frac{1}{n}$ has only four solutions?
Sep
24
awarded  Popular Question
Sep
20
revised Finding cos(A + B) from sin(A + B) — a sequel
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Sep
20
answered Finding cos(A + B) from sin(A + B) — a sequel
Sep
19
revised Can we express all doubly periodic functions as one of doubly periodic function?
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Sep
19
comment Can we express all doubly periodic functions as one of doubly periodic function?
@achillehui You mean we can select a base function ($\wp, \wp'$) in elliptic functions? I saw in the link that "It can be shown that this field is $\Bbb{C}(\wp, \wp')$, so that all such functions are rational functions in the Weierstrass function and its derivative". Do you know how can I prove it? thanks
Sep
19
revised Can we express all doubly periodic functions as one of doubly periodic function?
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Sep
19
comment Can we express all doubly periodic functions as one of doubly periodic function?
Thanks for information about 2D fourier series. I want to know if it is possible to express all elliptic functions as one of base elliptic function or not? I do not want to express 2D periodic signals as in series.
Sep
19
comment Can we express all doubly periodic functions as one of doubly periodic function?
@Did Yes It is.
Sep
19
asked Can we express all doubly periodic functions as one of doubly periodic function?
Sep
4
comment What if we change axiom of arithmetic?
If $x+y\neq y+x$ then you cannot create a number system because $1+1$ lead us to define the next number $2$. If $1+1\neq 1+1$ then we cannot define $2$, so how to create natural numbers. I think that the arithmatic what you think cannot have a number system.
Sep
3
revised $\int\frac{dx}{(x^2-x+1)\cdot \sqrt{x^2+x+1}}$
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Aug
21
revised To evaluate $\int_0^{+\infty} \frac{\;dx}{\sqrt[3]{x^3+a^3}\sqrt[3]{x^3+b^3}\sqrt[3]{x^3+c^3}}$
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Aug
21
revised To evaluate $\int_0^{+\infty} \frac{\;dx}{\sqrt[3]{x^3+a^3}\sqrt[3]{x^3+b^3}\sqrt[3]{x^3+c^3}}$
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Aug
21
awarded  Nice Question
Aug
15
revised proof for the Ramanujan's formula ?
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Aug
15
revised proof for the Ramanujan's formula ?
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Aug
15
comment proof for the Ramanujan's formula ?
@robjohn I have added some detail and the wiki reference. Thanks for your advice.