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MathGroup Archive 1998

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Re: Pb with finding a residue

  • To: mathgroup at smc.vnet.net
  • Subject: [mg14691] Re: [mg14643] Pb with finding a residue
  • From: Jurgen Tischer <jtischer at col2.telecom.com.co>
  • Date: Sun, 8 Nov 1998 21:15:49 -0500
  • Organization: Universidad del Valle
  • References: <199811070709.CAA01810@smc.vnet.net.>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Eric,
if you load Utilities`Notation` and Symbolize E_{n12} before using it as
a variable it should work.

Jurgen

Eric Le Bigot wrote:
> 
>   Hello,
> 
>   Mathematica fails to find a residue in some very simple cases, and I
> would be very glad if someone could tell me how Mathematica can find
> residues in such cases.  The problem can be easily seen in the two
> following lines:
> 
> \!\(Residue[1\/\(z\_12 - a\), {z\_12, a}]\)
> 
> \!\(Residue[
>     1\/\(z\_12 - \((\(I\ E\_n12\)\/\(-I\))\)\), {z\_12,
>       \((\(I\ E\_n12\)\/\(-I\))\)}]\)
> 
> The two cases are simple and only the first one is successfully computed
> by Mathematica.  The problem is that I need a *general* procedure that
> would allow correct computation in any such simple cases.
> 
>   Any help would be appreciated...
> 
>   EOL
> 
> --
> -------------------------------------------------------------------------------
> Eric-Olivier LE BIGOT (EOL)
> 
> Laboratoire KASTLER-BROSSEL, Case 74



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