Re: Eliminating unknown functions from partial differential equations
- To: mathgroup at smc.vnet.net
- Subject: [mg41069] Re: Eliminating unknown functions from partial differential equations
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Thu, 1 May 2003 04:57:48 -0400 (EDT)
- Organization: Universitaet Leipzig
- References: <b8o1b0$ov2$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
- Sender: owner-wri-mathgroup at wolfram.com
Hi,
eqn = {x'[t] == y[t],
y'[t] == -x[t]}
Eliminate[Join [eqn, D[#, t] & /@ eqn], {y[t], y'[t]}]
Regards
Jens
Stepan Yakovenko wrote:
>
> Hello all !
>
> Is it possible to eliminate some of unknown functions from a partial
> differential equation ?
> For instance :
>
> x'[t]=y[t]
> y'[t]=-x[t]
>
> ->
>
> x''[t]=-x[t]
>
> Thanx in advance.
>
>
>
> --
> Best regards,
> Stepan mailto:yakovenko at ngs.ru