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Re: Differential equation with several variables in the function
*To*: mathgroup at smc.vnet.net
*Subject*: [mg97273] Re: Differential equation with several variables in the function
*From*: dh <dh at metrohm.com>
*Date*: Mon, 9 Mar 2009 05:18:46 -0500 (EST)
*References*: <goqpau$lqg$1@smc.vnet.net>
Hi,
you must try to formulate your problem as simply a s possible. If your
consider f[x+y] then you should introduce a new variable z=x+y and
formulate your problem in terms of the one variable function f[z].
If you would give a simple example of your problem, you may get more
specific answers.
hope this helps, Daniel
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
>
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