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Re: Simple question about inverse of a function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg122636] Re: Simple question about inverse of a function
  • From: Alois Steindl <Alois.Steindl at tuwien.ac.at>
  • Date: Fri, 4 Nov 2011 06:00:04 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <j8tl31$f3e$1@smc.vnet.net>

Am 03.11.2011 09:58, schrieb Mikael:
> Sorry David, everything is fine with your solution. I had "Break at Messages" ticked and that caused my confusion.
>
> My sincere thanks to all who responded.
>
> Mikael
>
>> Thanks David for your reply but unfortunately the
>> solution does not work for me. I am running
>> Mathematica 8 under Windows 7 and the last expression
>> below does not result in any solution for me (I
>> waited several minutes). This is a copy of my
>> notebook which is exactly what you suggested:
>>
>> Clear[f,g]
>> conditions=0<=t<=1&&1<=theta<=Infinity;
>> f[theta_][t_]:=(1-t)^theta
>> g[theta_]=Assuming[conditions,InverseFunction[f[theta]
>> ]]
>>
>
Hello,
for me it worked immediately (also Win 7, Mathematica 8 (8.0.1)) and gave
1 - #1^(1/theta) &

Now g[\[Theta]][u] gives

1 - u^(1/\[Theta])


Maybe it helps to start a fresh session.

Alois



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