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computing residues

• To: mathgroup at smc.vnet.net
• Subject: [mg54785] computing residues
• From: mjumbo <mjumbo at nm.ru>
• Date: Tue, 1 Mar 2005 01:58:48 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

Hello,

I would like to compute residues of analytical function, but Mathematica's built-in function Residue produces extremely strange results. E.g.

Residue[1/Sin[z], {z, w}]

gives 0, I expected it produce some conditional expression, or at least to leave this expression unevaluated, but 0 is surely incorrect. 
What I am doing wrong?
 
MJM
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• Follow-Ups:
  • Re: computing residues
    • From: Daniel Lichtblau <danl@wolfram.com>
  • Re: computing residues
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>