Permutation

*To*: mathgroup at smc.vnet.net*Subject*: [mg9161] Permutation*From*: David Djajaputra <dd4b at virginia.edu>*Date*: Thu, 16 Oct 1997 03:38:01 -0400*Organization*: University of Virginia*Sender*: owner-wri-mathgroup at wolfram.com

Hello, Is it possible to ask Mathematica to expand an abstract algebraic formula? I mean, to do something like (1+x)^n = Sum[Binomial[n,m] x^m, {m,0,n}] I have in mind problems like determining, in closed form, the coefficient of (x^m y^n) in ((a+y) + (b+cx+dx^2))^k for example, which then can help in proving formulas, etc. Thanks a lot. David Djajaputra