Thank you very much, and Thanks to Ned and Ken too.

Best Regards to all.

Francisco.

Bob Arning wrote:
Using #() can create arrays of literals only - Floats, Integers, Strings
and Symbols. The Fractions you see are the result of a messages send
(the message #/ is sent to 3 with 4 as the argument). If you use the
brace constructor, you'll get what you wanted
> 
>         a _ {3/4 . 2/3}.
>         a collect: [ :each | each class] ====> #(Fraction Fraction)
> 
> Cheers,
> Bob
> 
> P.S. your mailbox is disabled