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How integrate x^x^x

  1. Dec 7, 2010 #1
    how integrate x^x^x ???my teacher ask me)what do you think about it?
     
  2. jcsd
  3. Dec 8, 2010 #2

    HallsofIvy

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    Re: warning!!!

    I would suggest numerically! Certainly there is no elementary function that has that as its derivative.
     
  4. Dec 8, 2010 #3
    Re: warning!!!

    I don't know, but I thougt in the Lambert function

    If we define [tex]x^x=z[/tex], then, x=[tex]\frac{ln(z)}{W(ln(z)}[/tex], where W is the Lambert function. So we can write

    [tex]x^z=\left(\frac{ln(z)}{W(ln(z)}\right)^z[/tex], and then integrate.

    I know, that this is awfull, but, maybe it can help or give any clue.
     
  5. Dec 8, 2010 #4
    Re: warning!!!

    Thanks)
    but i think it took not one hour to take the result
     
  6. Dec 9, 2010 #5
    Re: warning!!!

    @ Grufey : False because you forgot the dx.
    So, even more complicated !
    .
    @ Alejandroman8 : a primitive of x^(x^x) is the function Sphd(1,1;x)
    Is it a joke ? Just read the preamble of "The Somophore's Dream Function" :
    http://www.scribd.com/JJacquelin/documents
    A so simple answer ! (§.12) :rofl:
     
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