[GiNaC-list] lsolve

Hi guys, I am tring to solve a system (in my tests) like that: 16*Fv==16*k*p-32*m^2+16*k^2+32*p*p1 -16*Ga==0 -24*Fm*m^2-24*Fm*p*p1==0 2*m^2*Fs+2*p*Fs*p1==32*m*k*p+32*m^3+64*m*p*p1 8*m^2*Gp+8*p*Gp*p1==0 8*m^2*Ge-8*Ge*p*p1==0 {Fv==Fv,Ga==Ga,Fm==Fm,Fs==Fs,Gp==Gp,Ge==Ge} I think Ga==0, Fv== (...)/16 , etc. How to instruct lsolve only to solve nonzero elements? Thanks in advance, Marco A. F. Dias