Re: Proper classes

zuhair wrote: 
Robert Low wrote:

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.

why cardinality is a property of sets and not a property of proper
classes?


Why is having hair a property of mammals and not lizards?
.