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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.


Jun
2
comment Evaluate or Simplify $\int_{a}^{+\infty} \frac{\exp(-bx)}{x+c} Ei(x) dx$
@jack:Have a look to E1-Transform. As if your integral is related to that transform. Maybe the link can be helpful to you. m-hikari.com/ijcms-password2008/13-16-2008/…
Jun
1
comment how to calculate this infinite integral of infinite product of cosine
I just read the user13763's comment above.
Jun
1
comment how to calculate this infinite integral of infinite product of cosine
@GEdgar:We know now that the result will be less than π/4. I wonder if a value can be found that the integral result is bigger than the value. Thus the result can be narrowed and be bordered with 2 values. Thanks a lot for your answer.
May
26
comment How to find the interior angle of an irregular pentagon or polygon?
You can use dot product to find angles. en.wikipedia.org/wiki/Dot_product
May
25
revised Boundary conditions for a Weierstrass function
deleted 9 characters in body
May
25
revised Boundary conditions for a Weierstrass function
added 7 characters in body
May
25
answered Boundary conditions for a Weierstrass function
May
22
comment Parallel functions.
I opened a new separate question. math.stackexchange.com/questions/147857/…
May
21
revised What is the limit distance to the base function if offset curve is a function too?
deleted 111 characters in body
May
21
revised What is the limit distance to the base function if offset curve is a function too?
edited body; edited title
May
21
asked What is the limit distance to the base function if offset curve is a function too?
May
21
accepted What is the best strategy to find 2 circles whose total area is maximum in a triangle?
May
21
accepted Parallel functions.
May
21
answered Rewriting differential equation
May
21
comment Evaluating $\int_{-20}^{20}\sqrt{2+t^2}\,dt$
Have a look the example too .math.stackexchange.com/questions/120981/…
May
20
comment Showing a function satisfies a particular differential equation
Is it possible to find a general kernel for $y''-f(x).y=0$? Thanks a lot . My question is math.stackexchange.com/questions/99850/….
May
19
answered How are the sum and product of root formulas derived?
May
19
comment Parallel functions.
Very good examples Thanks a lot for graphs.Now I can see more general view of parallel curve reality. I wonder how we can find the limit distance to base function ($f(x)$) that parallel curves will be function too? Is It true that only line and circle have all parallel curves are also functions. Can we find other examples? Thanks
May
18
revised Parallel functions.
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May
18
revised Parallel functions.
added 4 characters in body