Operator Precedence/Boolean Logic

[Antoon Pardon]

Op 23-06-16 om 13:45 schreef Chris Angelico:
> On Thu, Jun 23, 2016 at 7:23 PM, Antoon Pardon
> <antoon.pardon at 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.