NDSolve, DSolve or what and how? !!
- To: mathgroup at smc.vnet.net
- Subject: [mg16399] NDSolve, DSolve or what and how? !!
- From: Elio Cecchetto <cecchetto at its.chem.uva.nl>
- Date: Thu, 11 Mar 1999 02:17:00 -0500
- Organization: its
- Sender: owner-wri-mathgroup at wolfram.com
I have the following differential equation to solve in the functions th[z] and phi[z]. As first I used the EulerEquations to expand the differential equation in two of them. But then I can't introduce boundary conditions in two different points at the same time. phi[0]==th[0]==0, phi[L]==Pi/2 th[L]==0 where L,k1,k2,k3,Ea and V are all fixed parameters (k1 Cos [th[z]]^2+k3 Sin[th[z]]^2)/2 th'[z]^2+ 1/2 Cos[th[z]]^2(k2 Cos[th[z]]^2+k3 Sin[th[z]]^2)phi'[z]^2 - Ea V^2/(8Pi) Sin[th[z]]^2 == 0 Do anyone have any suggest? Probably the solution is trivial, but I do not get it! Elio