Differential equation with several variables in the function

*To*: mathgroup at smc.vnet.net*Subject*: [mg97127] Differential equation with several variables in the function*From*: petterbe at gmail.com*Date*: Fri, 6 Mar 2009 04:23:05 -0500 (EST)

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

**Follow-Ups**:**Re: Differential equation with several variables in the***From:*DrMajorBob <btreat1@austin.rr.com>