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Re: RealValued functions and derivatives


Hello,

It might be better to post a little bit more of what you are trying to 
do. However, if you are manipulating a lot of expressions such as D[f,x]
(where f does not have a value) it can be helpful to simply define your 
own derivative - say dd[f,x] - and supply whatever rules you want for 
dd. You can also do something like expr /. dd->D to switch to the 
standard Mathematica derivative when you want to.

This may or may not help, depending on what exactly you are trying to do.

David Bailey
http://www.dbaileyconsultancy.co.uk


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