Problem with replacement rules

*To*: mathgroup at smc.vnet.net*Subject*: [mg91851] Problem with replacement rules*From*: Simula <simula at mit.edu>*Date*: Wed, 10 Sep 2008 05:08:53 -0400 (EDT)

Hello, I have a very simple question but I didn't find an answer in mathematica help. I use Solve[expression(x,y),x]. Then, x is obtained as a one-to-one function of y. I want to define the function x(y) using the output of Solve. How should I do? Thank you very much for your help. Best regards, Laurent