Re: solve differential equation problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg68856] Re: solve differential equation problem*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>*Date*: Mon, 21 Aug 2006 03:28:24 -0400 (EDT)*References*: <ec97dc$4b3$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Hi, can you explain your problem by an example ? that is *not* solved by Mathematica *and* produce the error message below ?? Regards Jens elvis wrote: > Here we often use mathematica to solve differential equations, when I > encouter a equation with several constrains I set them to those values. > But it cannot solve it and have the following warnings: > > DSolve::deqx: Supplied equations are not differential equations of > the given functions. > > Give a very simple differential equation here: > > DSolve[{y'[x] == r*y[x], y[0] == a}, y, x] > > Can anyone help to "solve" this problem for me? > Thanks! >