Solving Non-linear Differential Equations using DSolve

*To*: mathgroup at smc.vnet.net*Subject*: [mg109309] Solving Non-linear Differential Equations using DSolve*From*: RBenf <rui.benfeitas at gmail.com>*Date*: Wed, 21 Apr 2010 04:31:41 -0400 (EDT)

Hello! I'm having a problem solving non linear ordinary differential equations: when I try to solve this system, I get this error "Equations may not give solutions for all "solve" variables." The system is this: DSolve[{X8'[t] == C1 - C2 - k1*X1[t]*X8[t], X8[t1] == X8t1, X2'[t] == (-k2)*X2[t] + k1*X1[t]*X8[t],X2[t1] == X2t1, X3'[t] ==k2*X2[t] - k4*X3[t]*X4[t],X3[t1] == X3t1, X1[t] == PT - X2[t] - X3[t], X4'[t] == (-k4)*X3[t]*X4[t] + k5*X5[t],X4[t1] == X4t1, X5[t] == TRXT - X4[t]}, {X1[t],X8[t],X2[t],X3[t],X4[t],X5[t]}, {t}]/.t->t1 + d T Can anyone please help me figure out how to solve this error? Thanks so much for all the help