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

␈↓ ↓H␈↓∧Telephone 415 497-4430␈↓ 	SNovember 22, 1978 




␈↓ ↓H␈↓Professor Barbara Partee
␈↓ ↓H␈↓Department of Linguistics
␈↓ ↓H␈↓University of Massachusetts
␈↓ ↓H␈↓Amherst, MA 01003

␈↓ ↓H␈↓Dear Barbara:

␈↓ ↓H␈↓        I␈αhave␈αjust␈αread␈αyour␈α␈↓↓Semantics␈α-␈αMathematics␈αor␈αPsychology␈↓␈αand␈αhave␈αone␈αcomment.␈α The
␈↓ ↓H␈↓di≠culties␈αyou␈αraise␈α
seem␈αreal␈αto␈αme,␈α
but␈αnotice␈αthat␈αthe␈α
psychological␈αhypothesis␈αhas␈αno␈α
necessary
␈↓ ↓H␈↓relation␈αto␈αhuman␈αbeings␈αbut␈αapplies␈αto␈αany␈αactual␈αuser␈αof␈αlanguage␈αincluding␈αmachines.␈α In␈αjust
␈↓ ↓H␈↓the␈αways␈αyou␈αdescribe␈αhumans␈αas␈αimperfect,␈α
any␈αmachine␈αexisting␈αin␈αthe␈αreal␈αworld␈αmust␈α
also␈αbe
␈↓ ↓H␈↓imperfect.␈α For␈αthis␈αreason␈αthe␈αterm␈α␈↓↓psychological␈↓␈αshould␈αbe␈αchanged␈αto␈αsomething␈αlike␈α␈↓↓operational␈↓
␈↓ ↓H␈↓or else quali≡ed to have that meaning.

␈↓ ↓H␈↓        I am looking forward to the meeting.


␈↓ ↓H␈↓Best regards,



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