> In a message dated 95-09-12 00:37:50 EDT, you write:
>
>>SOME kind of relation between any two entities. Ultimately, just by being
>>CONSIDERED together in the same frame is a common property.
>>
>>
>
> Cliff, this is the meaning of a set, not a system. And equating "set" with
> "system" leads to severe philosophical and practical confusions. Systems
> Theory (the study of interrelated things) is a subset of Set Theory (the
> study of groups of things), not the reverse.
This seems to ignore the role of category theory which is a systems theoretical
approach and includes set theory as a subset. In Rosen's hands, this distinctio
n
is extremely important!
Best wishes,
Don Mikulecky