From Sampsa Hautaniemi, NIH:
I am at the halfway of your book Causality, which I think to be excellent and instructive. What I am writing to you is that I browsed to homepage of Dr. Lotfi Zadeh and found out that he has a Word document whose subject is 'CAUSALITY IS UNDEFINABLE'. The page is http://www.cs.berkeley.edu/~nikraves/zadeh/Zadeh2.doc. I know you have answered many times reports like that, so if there is already discussion going on of this subject I would appreciate the URL/name of the journal as I am really interested in the subject.