Re: Finding the inverse of a function?
- To: mathgroup at smc.vnet.net
- Subject: [mg24198] Re: Finding the inverse of a function?
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Fri, 30 Jun 2000 01:57:27 -0400 (EDT)
- Organization: Universitaet Leipzig
- References: <8jebnp$jen@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi,
which one ? if you have Sum[a[i]x^i,{i,0,n}]=y
Mathematica can try to Solve[] the polynom equation
but you will get n solutions and Mathematica can't
decide for you what solution is your inverse function.
Since only for n<=4 exact formulas are known Mathematica
may not be able to find all solutions as readable
(not Root[] objects) expressions.
Regards
Jens
heathw at in-tch.com wrote:
>
> Hi,
> Is there some way to make Mathematica find the inverse of a user defined
> function? I read the Mathematica Book and found InverseFunction[ ] but
> it will only show the inverse of a Mathematica function. I would like to
> be able to find the inverse of polynomials.
> Thanks,
> Heath