Interface of the set classes
tjreedy at udel.edu
Fri Oct 29 20:09:30 CEST 2004
"Pierre Barbier de Reuille" <pierre.barbier at cirad.fr> wrote in message
news:41824654$0$1779$636a15ce at news.free.fr...
> For me, sets are first sequences.
In mathematics, a set is determined by its members. Period. The concept
'ordered set' -- a set with an order relation on its members, where a
relation is a set of ordered pairs -- is a specialization (and
complexification) of the concept 'set'. If some other language misuses
'set' to mean 'ordered set', you have been done a disservice by that
Terry J. Reedy
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