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Re: Defining derivatives

• To: mathgroup at smc.vnet.net
• Subject: [mg87996] Re: Defining derivatives
• From: AES <siegman at stanford.edu>
• Date: Mon, 21 Apr 2008 14:37:15 -0400 (EDT)
• Organization: Stanford University
• References: <fu9vnl$igu$1@smc.vnet.net> <fueeme$b6g$1@smc.vnet.net> <fuhfi8$isc$1@smc.vnet.net> <fuhr01$rht$1@smc.vnet.net>

In article <fuhr01$rht$1 at smc.vnet.net>,
 Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com> wrote:

> Nevertheless, this approach is less generic than Carl Woll's solution
> 
>      Derivative[1][f1] = f2;
> 

What can one _do_ with this construction?  

Presumably it's executed in situations where f2 is already defined, and 
f1 isn't --- ?? --- and when executed creates f1 (to within a constant 
of integration)?

Can one then plot or evaluate f1, without further ado?