Re: Solving a DE using Mathematica
- To: mathgroup at smc.vnet.net
- Subject: [mg90450] Re: Solving a DE using Mathematica
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Thu, 10 Jul 2008 06:32:11 -0400 (EDT)
- Organization: Uni Leipzig
- References: <g51uce$6tj$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
Hi,
first you should not use 0.016 and I change it to the symbol a
de = (-l^2 - m^2 + n^2/(r + a*z)^2) Z[z] + Z''[z] == 0
sol = DSolve[de, Z[z], z] //
FullSimplify[#, Element[{l, m, n}, Integers]] &
and
First[(de /. {#, D[#, z, z]} & /@ sol[[1]])] // FullSimplify
gives true.
So what is your problem ?
Regards
Jens
Greg wrote:
> I'm having problems solving this problem although it should appear pretty straightfoward:
>
> (-l^2 - m^2 + n^2/(r + 0.016 z)^2) Z[z] + Z''[z] == 0
>
> I am solving for Z[z]. These are the lines I use:
>
> DSolve[Above Equation, Z[z], z]
>
> I get an odd solution so I do a solution check plugging back in Z[z] and Z''[z] yet I don't get 0. In the above, l,m,n,r are all constants.
>