Evidence Against The Context-Freeness Of Natural Language
by Shieber, Stuart M.
Technical Note 330
Institution: AI Center, SRI International
Address: 333 Ravenswood Ave., Menlo Park, CA 94025
Jun 1984.
In searching for universal constraints on the class of natural languages, linquists have investigated a number of formal properties, including that of context-freeness. Soon after Chomsky’s categorization of languages into his well-known hierarchy [Chomsky, 1963], the common conception of the context-free class of languages as a tool for describing natural languages was that it was too restrictive a class–interpreted strongly (as a way of characterizing structure sets) and even weakly (as a way of characterizing string sets).
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