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Series[] command

• To: mathgroup at smc.vnet.net
• Subject: [mg55939] Series[] command
• From: "Kris Preacher" <preacher at unc.edu>
• Date: Sun, 10 Apr 2005 23:07:18 -0400 (EDT)
• Organization: University of North Carolina at Chapel Hill
• Sender: owner-wri-mathgroup at wolfram.com

Hi all,

I need to obtain the second-order Taylor series expansion of a*b around the
points ma and mb. I thought Mathematica's Series[] command would do the
trick, but no. The correct answer is:

ma*mb + ma(b-mb) + mb(a-ma) + (a-ma)(b-mb)

Mathematica gives:

b(a-ma) + ma(b-mb) + ma*mb

Whaddup??

Thanks,
Kris Preacher
UNC

• Follow-Ups:
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    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>
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  • Re: Series[] command
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