Re: Differential equation with several variables in the function
- To: mathgroup at smc.vnet.net
- Subject: [mg97160] Re: Differential equation with several variables in the function
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Fri, 6 Mar 2009 05:38:58 -0500 (EST)
- Organization: Uni Leipzig
- References: <goqpau$lqg$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
Hi, if you wish to solve a differential equation you can't say that the function should have the form f[x+y], because the *differential equation* determines how the solution look like and not *you*. If you know how the solution look like, you don't need to solve the equation any more. Regards Jens petterbe at gmail.com wrote: > Hi, > I have a differential equation were the function F[.] depends on > several varibles,x,y,z. I would like to solve the differential > equation for the entire function. However, I only manage to get > solutions from Mathematica if I have one variable in the function. For > example DSolve[egn==0, F[x],x]. If i try to solve for my entire > function F[x+y+z] using DSolve[egn==0, F[x+y+z],x] or even just add 1 > to the function (F[x+1]) I get the error message "DSolve::litarg: To > avoid possible ambiguity, the arguments of the dependent variable in > XXX should literally match the independent variables." > > Does anybody have some good suggestions? > Thanks >