[Maxima] Using a function as an input to a procedure?

[Jaime Villate]

On Fri, 2008-05-02 at 06:30 -0700, Richard Fateman wrote:
> Jaime's example uses EXPRESSIONS  like x^2.
> Alasdair's question may be about FUNCTIONS like f,  where f(x):=x^2.

He also used the term "procedure" to refer to those defined with := so I
was under the impression that he meant functions in the mathematical
sense. But you might be right; I might have misunderstood his question.
Jaime