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Re: Defining derivatives

In article <fuhr01$rht$1 at>,
 Jean-Marc Gulliet <jeanmarc.gulliet at> 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?

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