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Defining derivatives

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  • Subject: [mg87851] Defining derivatives
  • From: dh <dh at>
  • Date: Fri, 18 Apr 2008 07:11:33 -0400 (EDT)

Hello All,

does anybody know how to define symbolic derivatives. E.g.:



this does not work because f on the lefthand side is evaluated. To 

prevent this (do not forget to remove f before redefining it):



this gives no message, but f'[x] returns f1[x] instead of f2[x].

The same thinhg happens when you change the sequence of definitions:



Further, where is the information about derivatives stored?

thank's a lot, Daniel

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