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MathGroup Archive 2003

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Re: Log Equation

  • To: mathgroup at
  • Subject: [mg44773] Re: Log Equation
  • From: "Alan" <infoNOSPAM at>
  • Date: Tue, 25 Nov 2003 00:45:47 -0500 (EST)
  • References: <bps4gf$9uj$>
  • Sender: owner-wri-mathgroup at

Mathematica can solve it: just type

Solve[y Log[x] == (1 - x), x]

The result is in terms of the ProductLog, aka the Lambert W function, a
built-in function.

regards, alan

"Bernard Bourée" <bernard at> wrote in message
news:bps4gf$9uj$1 at
> I 'm trying to find a way to solve the equation
> y = (1-x)/ Log(x)
> How can I find x when y is known ?
> Is there a numerical method ?
> with series development?
> -- 
> Bernard Bourée
> bernard at

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