Op 23-06-16 om 13:45 schreef Chris Angelico: > On Thu, Jun 23, 2016 at 7:23 PM, Antoon Pardon > <antoon.par...@rece.vub.ac.be> wrote: >> I don't care. In modern mathematics, zero is usaly defined as the >> empty set. The empty set contains nothing, but it isn't nothing >> itself. Otherwise the empty set would be the same as the set >> containing the empty set, since they both would contain the same, >> being nothing. > Zero is *the cardinality of* the empty set. The set containing the > empty set has a cardinality of 1.
In modern set theory where the integers are defined as specific kind of sets, zero *is* the empty set. -- Antoon. -- https://mail.python.org/mailman/listinfo/python-list
