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Integrating 1/x*e^x dx from 0 to s, how to do it

  1. Sep 22, 2010 #1
    Hi

    I have an integral as follows,

    int((1/x)exp(-x),x,0,s)

    I want to integrate from [0,s).

    My question is how to integrate without including s as the upper bound.

    Any help will be appreciated
     
  2. jcsd
  3. Sep 22, 2010 #2
    Re: Integrals

    Integrate from [0,s-a] in the limit as a -> 0?
     
  4. Sep 22, 2010 #3
    Re: Integrals

    Hey

    Thanks for the reply.

    If the integral is the lower gamma incomplete function, which is

    int(exp(-t)*t^(a-1),t,0,x)

    how would I be able to evaluate the integral between [0,x-a) as a->0 ?
     
  5. Sep 22, 2010 #4
    Re: Integrals

    well u are right

    but i dont know, his question doest sound too sensible to me

    then by anser u gave it obviously means changing parameters of integration
     
  6. Sep 22, 2010 #5
    Re: Integrals

    Hi sachinism

    I hope I cleared up my question with my last post.

    Any help will be great
     
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