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

Algebra of differential operators

• To: mathgroup at smc.vnet.net
• Subject: [mg39246] Algebra of differential operators
• From: Paolo Zavarise <NOSPAMpaolozavarise at libero.it>
• Date: Thu, 6 Feb 2003 03:06:47 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

I've looked old messages but i don't find a clear answer.

What's the best way (simple, general and without dummy functions) to define 
in mathematica 4.2 a differential operator?

For example, how can I evaluate laplacian operator in spherical coordinates 
? (without using ad-hoc packages... i want to enter expression of d/dx, 
d/dy, d/dz and mathematica must compute (d/dx)^2+(d/dy)^2+(d/dz)^2)

How can i evaluate powers,product etc... of operators ?

Help me, thanks
Paolo Zavarise