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Derivative of multiargument function

• To: mathgroup at smc.vnet.net
• Subject: [mg29678] Derivative of multiargument function
• From: guido <carlet at sissa.it>
• Date: Tue, 3 Jul 2001 04:40:31 -0400 (EDT)
• Organization: CINECA
• Sender: owner-wri-mathgroup at wolfram.com

If I have the assignement:
g[z_] = 0
then any time I have:
Derivative[1][g][z]
I obtain zero and this is ok.
But if I have a sequence of functions with j=1,2,...
and I give the assignment:
g[z_,1] = 0
then Mathematica doesn't seem to give zero when it finds:
Derivative[1,0][g][z,1]
as before...
does anybody know how to let Mathematica compute the derivative even
in this case ?
Thank you very much...