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Function [OBSOLETE] --
In CoCoA-5 functions are "first class objects", and so may be passed
like any other value -- the operator
serves no purpose.
In CoCoA-4 it was possible to have a variable and a function with the
same name; the operator
was used to instruct CoCoA-4
to search for the function of the given name, e.g. to pass it as
an argument to another function.