Re: DSolve solution validation
- To: mathgroup at smc.vnet.net
- Subject: [mg33939] Re: DSolve solution validation
- From: Gerhard Wesp <gwesp at cosy.sbg.ac.at>
- Date: Wed, 24 Apr 2002 01:21:45 -0400 (EDT)
- Organization: Department of Computer Science, Salzburg University
- References: <aa3fm7$7pl$1@smc.vnet.net>
- Reply-to: gwesp at cosy.sbg.ac.at
- Sender: owner-wri-mathgroup at wolfram.com
Vladimir Bondarenko <vvb at mail.strace.net> wrote: > DSolve[y'[z] == Abs[y[z]], y[z], z] this is a good example where the built-in human DSolve works better than Mathematica's :-) y'=abs(y) has the solution y = C e^z. depending on the sign of C, y is either always positive or always negative. regards, -gerhard