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 January 14th, 2009, 10:32 AM #1 Newbie   Joined: Jan 2009 Posts: 1 Thanks: 0 Looking for a formula Hi everyone! I'm trying to find a formula. I've gotten a formula reduced to $y=c\frac{1}{(u)}e^u$, and I'm trying to solve for u. I looked at the Lambert W function, but that doesn't seem to help so much with the u in the denominator. If anyone can point me in the direction of a way to solve this, I would appreciate it very much! Thank you!
 January 16th, 2009, 12:15 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,481 Thanks: 2041 $-ue^{-u}\,=\,-\frac{c}{y}\,,$ and you can solve that using the Lambert W function.

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