[Date Index] [Thread Index] [Author Index]

collect derivatives

• To: mathgroup at smc.vnet.net
• Subject: [mg23259] collect derivatives
• From: Robert <robert.schuerhuber at gmx.at>
• Date: Sat, 29 Apr 2000 22:05:02 -0400 (EDT)
• Organization: Vienna University of Technology, Austria
• Sender: owner-wri-mathgroup at wolfram.com

is there a way to use "collect[]" to collect all terms with a specific
derivative, e.g. to produce something like

z''[x] u[x] + z'[x] (u'[x]+u[x]) + z[x]

?

thanks, robert