Simple question about inverse of a function

*To*: mathgroup at smc.vnet.net*Subject*: [mg122502] Simple question about inverse of a function*From*: Mikael <mikaen.anderson.1969 at gmail.com>*Date*: Sun, 30 Oct 2011 04:22:58 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com

I have a simple question on how to calculate the inverse of a a function. This is the function I define: f[t_] := (1 - t)^theta To calculate the inverse I write: Assuming[t >= 0 && t <= 1 && theta >= 1 && theta < Infinity, { InverseFunction[f[t]]}] but the answer I get is {InverseFunction[(1 - t)^theta]}. Now I know I can do this: In[11]:= Solve[f[g[x]]==x,g[x]] Out[11]= {{g[x]->1-x^(1/theta)}} but I wonder what is the correct way of specifying assumptions on t and theta to make the InverseFunction work. Thanks.

**Follow-Ups**:**Re: Simple question about inverse of a function***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>

**Re: Simple question about inverse of a function***From:*DrMajorBob <btreat1@austin.rr.com>

**Re: Simple question about inverse of a function***From:*Bob Hanlon <hanlonr357@gmail.com>