Re: Proper classes

zuhair wrote:
Robert Low wrote:
zuhair wrote:
What is the cardinality of the proper class of all sets. 
The same as it was the last time you asked. It doesn't have
one.

I want to know why it does not have one.
Why sets has cardinality , while proper classes doesn't.


Because cardinality is a property of sets, and proper classes
aren't sets.


.