Q: Collect, Coefficient, and non-integer exponents

*To*: mathgroup at smc.vnet.net*Subject*: [mg8733] Q: Collect, Coefficient, and non-integer exponents*From*: sergio at scisun.sci.ccny.cuny.edu (Sergio Rojas)*Date*: Sat, 20 Sep 1997 22:28:01 -0400*Organization*: City College Of New York - Science*Sender*: owner-wri-mathgroup at wolfram.com

(** Hi folks, Assume that for fun one want to deal with an expression containing non-integer powers of a certain variable x. Take as an illustration the following expression; ******) expr = Expand[Sum[(a*n +b*n -c)*x^(n+0.12/n),{n,1,4}]]; (** One knows in advance that a power of x is, for example, 1.12 and we want to know its coefficient. Apparently Coefficient and Collect work only with integers. Is there a way to deal with this situation? Salut, Rojas E-mail: sergio at scisun.sci.ccny.cuny.edu PS. I am using Mathematica: In[37]:= $Version Out[37]= DEC OSF/1 Alpha 2.2 (September 9, 1994) ******)