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Re: Series[] command

• To: mathgroup at smc.vnet.net
• Subject: [mg55942] Re: [mg55939] Series[] command
• From: yehuda ben-shimol <bsyehuda at gmail.com>
• Date: Mon, 11 Apr 2005 03:14:51 -0400 (EDT)
• References: <200504110307.XAA06466@smc.vnet.net>
• Reply-to: yehuda ben-shimol <bsyehuda at gmail.com>
• Sender: owner-wri-mathgroup at wolfram.com

Hi,
 a*b is only FIRST ORDER expression in terms of a and b so you could't
expect of getting higher degrees then 1. are'nt you confusing a*b with
f[a*b] or f[a,b]??
yehuda

On Apr 11, 2005 5:07 AM, Kris Preacher <preacher at unc.edu> wrote:
> 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
> 
>

• References:
  • Series[] command
    • From: "Kris Preacher" <preacher@unc.edu>