standard explanation in the neo-Fregean tradition is, as we have seen, to declare the structure (sentence, representation) to be interpretable as a function or abstract procedure. It is exploration of this formulation that remains the question mark at the heart of all accounts of PS.
The remarks in this section would not survive even the level of analysis given to the authors discussed in the body of the chapter, though I hope they will in due course. The important thing is that research continues in AI on a PS theory of meaning, based on the basic insights of the field rather than being imported from outside.
This work has been supported under the NATO Senior Scientists Program. The author is indebted to comments from, and conversations with, Jim Doran, Frank Brown, Doug Arnold, Barry Richards, Tony Rhodes, Ernest Gellner, John Watkins, Roger Schank, and Wendy Lehnert, though they are not, of course, responsible for anything in it.
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