MathGroup Archive 2003

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: RE: Re: More integration/ fullsimplify bugs in Mathematica 4.1

  • To: mathgroup at smc.vnet.net
  • Subject: [mg41709] Re: [mg41687] RE: [mg41672] Re: [mg41651] More integration/ fullsimplify bugs in Mathematica 4.1
  • From: Bobby Treat <drmajorbob+MathGroup3528 at mailblocks.com>
  • Date: Mon, 2 Jun 2003 04:35:18 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Sorry.  I'm using version 4.2.1.

Bobby

-----Original Message-----
From: Yahoo <stefanofricano at yahoo.it>
To: mathgroup at smc.vnet.net
Subject: [mg41709] [mg41687] RE: [mg41672] Re: [mg41651] More integration/ 
fullsimplify bugs in Mathematica 4.1

At my machine, I get the following:

(second) Out[4]=((-1 + n) Gamma[1 - n] (-1 +
       1      b + 2 a x     n
      (- + ----------------)  (-1 + Gamma[2 - n])
       2           2
            2 Sqrt[b  - a c] Hypergeometric2F1Regularized[1 - n, n, 2 - 
n,

        1      b + 2 a x           c               n
        - - ----------------])) / (- + x (b + a x))    2 Sqrt[b  - a c]
        2           2              4


So, where is the problem? In machine used?

Fricano Stefano,

->-----Original Message-----
->From: Bobby Treat [mailto:drmajorbob+MathGroup3528 at mailblocks.com]
To: mathgroup at smc.vnet.net
->Sent: Friday, May 30, 2003 9:56 AM
->To: mathgroup at smc.vnet.net
->Subject: [mg41709] [mg41687] [mg41672] Re: [mg41651] More integration/ 
fullsimplify bugs
in
->Mathematica 4.1
->
->
->At my machine, I get the following:
->
->Integrate[1/(a*x^2 + b*x + c/4)^n, x];
->FullSimplify[%];
->D[%, x];
->FullSimplify[%]
->
->(c/4 + x*(b + a*x))^(-n)
->
->Bobby
->
->-----Original Message-----
->From: Richard Fateman <fateman at cs.berkeley.edu>
To: mathgroup at smc.vnet.net
->To: mathgroup at smc.vnet.net
->Subject: [mg41709] [mg41687] [mg41672] [mg41651] More integration/ fullsimplify 
bugs
->in Mathematica
->4.1
->
->Integrate[1/(a*x^2 + b*x + c/4)^n, x]
->FullSimplify[%]
->D[%,x]
->InputForm[FullSimplify[%]] ==>
->
->    (4^n*(-1 + n)*Gamma[1 - n]*
->   (-1 + (1/2 + (b + 2*a*x)/(2*Sqrt[b^2 - a*c]))^n*
->     (-1 + Gamma[2 - n])*Hypergeometric2F1Regularized[
->      1 - n, n, 2 - n, 1/2 - (b + 2*a*x)/
->        (2*Sqrt[b^2 - a*c])]))/(c + 4*True*(b + a*True))^n
->
->notice the denominator has some variable "True" in it.
->
->Cheers.
->RJF
->


  • Prev by Date: Re: Re: Beginner question: operating on piecewise defined functions
  • Next by Date: Re: UH oh, integration of rational functions has a bug.
  • Previous by thread: Re: Re: Beginner question: operating on piecewise defined functions
  • Next by thread: Re: More integration/ fullsimplify bugs in Mathematica 4.1