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␈↓ ↓H␈↓␈↓βS␈↓∧ Artificial Intelligence Laboratory, STANFORD UNIVERSITY, Stanford, California 94305

␈↓ ↓H␈↓∧Telephone 415 497-4430␈↓ 	TDecember 17, 1979 




␈↓ ↓H␈↓Dr. Joel L. Lebowitz
␈↓ ↓H␈↓New York Academy of Sciences
␈↓ ↓H␈↓2 E. 63rd St.
␈↓ ↓H␈↓New York, N.Y. 10021

␈↓ ↓H␈↓Dear Dr. Lebowitz:

␈↓ ↓H␈↓        This␈α
is␈α
to␈αaccept␈α
your␈α
invitation␈α
to␈αbe␈α
part␈α
of␈α
the␈αAmerican␈α
Organizing␈α
Commitee␈α
of␈αthe
␈↓ ↓H␈↓4th␈α
International␈α
Conference␈α
on␈α
Collective␈α
Phenomena.␈α
 I␈α
could␈α
also␈α
attend␈α
the␈α
conference␈αif␈α
there
␈↓ ↓H␈↓was␈α∞a␈α∞source␈α∞to␈α∞travel␈α∞funds.␈α∞ I␈α∞would␈α∂then␈α∞give␈α∞a␈α∞paper␈α∞entitled,␈α∞␈↓↓Circumscription␈α∞-␈α∞A␈α∂Form␈α∞of
␈↓ ↓H␈↓↓Non-Monotonic Reasoning␈↓.


␈↓ ↓H␈↓Sincerely,



␈↓ ↓H␈↓John McCarthy
␈↓ ↓H␈↓Director
␈↓ ↓H␈↓Professor of Computer Science