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Re: solve this equation?
*To*: mathgroup at smc.vnet.net
*Subject*: [mg7304] Re: solve this equation?
*From*: Eugene Lee <elee at aw.sgi.com>
*Date*: Fri, 23 May 1997 01:41:33 -0400 (EDT)
*Organization*: Alias Wavefront
*Sender*: owner-wri-mathgroup at wolfram.com
Wilson Figueroa wrote:
>
> There is a problem with your solution.
>
> Check the basic math once more.
>
> Eugene Lee <elee at aw.sgi.com> wrote in article
> <5k6g77$5bf$1 at dragonfly.wolfram.com>...
> > Hong-liang Xie wrote:
> > >
> > > Can Mathematica be used to handle equations as follows:
> > >
> > > u[x] = 0.5 u[x-1] + 0.5 u[x+1]
> > > u[ 4] = 1
> > > u[-4] = 0
> > >
> > > and find result for, say, u[0]? Note that transforming
> > > the equation to
> > >
> > > 2u[x+1] = u[x] - u[x-1]
> > >
> > > doesn't help since the initial conditions are given on
> > > the points 4 and -4.
> > >
> > > Any hint would be appreciated. Thanks a lot!
> > >
> > > Hong
> >
> > You don't need Mathematica at all. The equation
> > u[x] = 0.5 u[x-1] + 0.5 u[x+1]
> > is satisfied by any linear function (ie, whose graph is a straight
> > line). The boungary conditions then fix the line, giving the solution as
> > u[x]=(x+4)/8
> >
> > By the way, your transformed equation is written incorrectly.
There is no problem with my solution. Ask any mathematician if you don't see.
Eugene Lee
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