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Wierdness with the laplacian

• To: mathgroup at smc.vnet.net
• Subject: [mg45132] Wierdness with the laplacian
• From: Peter Jay Salzman <p at dirac.org>
• Date: Wed, 17 Dec 2003 07:54:46 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

Hi all,

When I do:

	<<Calculus`VectorAnalysis`
	SetCoordinates[Spherical[r, theta, phi]
	Laplacian[ Exp[r^2] ]

Mathematica gives:

                2                     2
               r   2                 r   4
Csc[theta] (6 E   r  Sin[theta] + 4 E   r  Sin[theta])
------------------------------------------------------
                           2
                          r

Which is wrong since Exp[r^2] is not a function of theta or phi.


Why is Mathematica giving this result?

Thanks!
Pete

• Follow-Ups:
  • Re: Wierdness with the laplacian
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>