LinearSolve and System Equation

*To*: mathgroup at smc.vnet.net*Subject*: [mg65993] LinearSolve and System Equation*From*: Oumaimaa <abdou.oumaima at hotmail.com>*Date*: Wed, 26 Apr 2006 04:37:47 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Hello evrybody, I'm doing some numerical results of a system of equations Sum[(A[l,n] + B[l,n] ksi)Psimoins[n],{l,o,L}]== Sum[C[l,n] Psiplus[n],{l,0,L}] I want to find a symbolic result in this form: Psimoins[n]=Psiplus[n]+Sum[M[n,n']Psiplus[n'],{n',0,n}] So How to reduce the first form to the second. I'm in mess and I find some numerical result with initial values of Psiplus, A, B and C but not symbolic one. Psiplus and Psimoins are matrices with indices n and l. A, B and C and functions of parametres n and l. So please can you help?!!!! regards Oumaimaa