RE: some basic questions, thanks

My opinion, maybe it’s wrong:
 
1. I think it does and when I express A is the subclass of both B and C,
I can only use that A is the intersection of B and C. and it’s
different between that A is the subclass of the intersection of B and C
and A is the equivalent class of the intersection of B and C.
2. I think it’s not exactly. If A is the subclass of union of B and C,
then the instances of B and C are not sure instances of A, if A is the
equivalent class of union of B and C, then the instances of B and C are
surely instances of A.
3. I think it’s not exactly either. I think you know the reason.
4. Yes, it does.
 
If I have anything wrong, would you please remind me?
Thanks very much
 
Best regards,
Zhu Bin
 
-----Original Message-----
From: www-rdf-logic-request@w3.org [mailto:www-rdf-logic-request@w3.org]
On Behalf Of Li Qin
Sent: 2003年9月19日 8:49
To: www-rdf-logic@w3.org
Subject: some basic questions, thanks
 
1. If A is the intersection of B and C, does it mean that A is the
subclass of both B and C?
 
Is it correct that the instances of A are also instances of B and C
while the common instances of B and C are also instances of A?
 
2. If  A is the union of B and C, the instances of B and C are also
instances of A. How does it differ from the relationship between
subclass and superclass where the instances of the subclass are also
instances of the superclass?
 
Does A have its own instances in addition to the instances of B and C?
 
3. If A and B are complement of each other, does it mean there exists a
C who is the union of A and B or the superclass of A and B?
 
4. If a class has subclasses, does this class have instances of its own
in addition to the instances of its subclasses?
 
Thank you in advance.


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