This is indeed the definition used in the clojure.contrib.pred library:
http://github.com/kevinoneill/clojure-contrib/tree/master/src/clojure/contrib/pred.clj#L45

- Mark M.

On Fri, Dec 5, 2008 at 8:07 AM, Arie van Wingerden <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I am learning Clojure by working thru Kent Dybvigs book in Scheme and
> Clojure at the same time. A nice way to discover the differences ;-)
>
> I wonder if the next definition is appropriate to test if something ia an
> atom (as Scheme sees it):
>
> (defn atom? [x]
>       (not (coll? x)))
>
> Thx,
>    Arie
>
>
> >
>

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