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\address
Professor G.  Mints
Institute of Cybernetics
Estonian Academy of Science
200108, Tallinn
U.S.S.R.
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Dear Dr. Mints:

	I was in Peking last week and renewed my acquaintance with
Professor Ma Xiwen of Peking University.  He is working in the logic of
knowledge, and I think he would be an excellent person to invite to the
Tallinn conference if that possibility still exists.  He believes that he
could still manage the travel to the Soviet Union if invited soon.

	His address is

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\halign{\qquad # \hfil \cr
Ma Xiwen\cr
Vice Director of Institute of Computer Science and Technology\cr
Peking University\cr
Beijing, China\cr
(office: 28.2471 ext. 3725)\cr
(home: 256-1171)\cr
(fax:  086 01 201-9541)\cr}

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Sincerely,
John McCarthy
Professor
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