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Question: Extracting coefficient in Taylor and Laurent expansions

Question:Extracting coefficient in Taylor and Laurent expansions

smith_alpha 155 Maple
December 10 2014
1

Hi,

 

  Excuse me, I tried to substract in a series expansion. It works for Taylor-type expansion, but not Laurent-type ones

*********

ffff:=1/(t-3);
ggg:=taylor(ffff,t=infinity,3);
coeff(ggg,t,-1);


ffff:=exp(t);
ggg:=taylor(ffff,t=0,3);
coeff(ggg,t,1);

*********

Maple gives me


Error, unable to compute coeff


1

 

. My question is, why "coeff" does not work in the first case? how to make it work? Though I can copy the expansion part, assign it to another variable, and "coeff" will work

 
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