Re: Function of a function problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg100174] Re: Function of a function problem*From*: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>*Date*: Wed, 27 May 2009 04:06:50 -0400 (EDT)*References*: <gvdr44$708$1@smc.vnet.net>

This is not generally the type of equations that Solve solves. Read its documentation page to see what cases it handles. BTW the underscore in your equation shouldn't be there. Sjoerd On May 25, 12:15 pm, Narasimham <mathm... at hotmail.com> wrote: > I sort of assumed that Mathematica should readily solve function of > function equations like ... > > Equn = { f [x_] == f [ f [x] ] - 2 x } > > Solve[Equn, f , x] > > , but it does not. Is there a better some other way to code it? This > is based on William Elliot's post in sci.math > > http://groups.google.co.in/group/sci.math/browse_thread/thread/659ea3... > > Narasimham