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MathGroup Archive 2000

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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


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