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- April 24th 2008, 08:19 AMragungsIntegral of x/[1+exp(x)] dx
- April 24th 2008, 08:41 AMtopsquark
- April 24th 2008, 08:45 AMragungs
I need the true value of this integral to calculate the error of my approximation.

I wonder if this integral can be solved by hand. - April 24th 2008, 08:52 AMtopsquark
As I said there is no closed form expression. You cannot get an exact value of it.

There is no expression for that summation in terms of elementary functions. This thing can only be approximated.

-Dan

Edit: A made a mistake in copying "polylog" function from the Integrator site. I have fixed it. - April 24th 2008, 08:52 AMAryth

I used my graphing calculator to calculate the integral... It's not exact either, but it's closer than a lot of people can get. - April 24th 2008, 08:58 AMragungs
ok thanks all.

- April 24th 2008, 02:49 PMCaptainBlack
- April 24th 2008, 02:53 PMMathstud28