While the formalism for context-free grammars is described as ( p 80) A context-free grammar is 4-tuple (T N S P ). To give an example Grammar(1) T = - Det Noun Verb N = - S NP VP S = S P = - S -? NP VP NP -? Det Noun VP -? Verb NP is a particular context-free grammar. This distinction is often blurred in computational linguistics. The first point to make, and probably the most important, is a distinction between grammar and formalism. Finally some discussion is given on the relevance of the these results. Over the past thirty years, broadly diverse audiences have gathered to attend his sold-out lectures. Also, it describes how any Turing machine can be implemented as a feature grammar showing that the power. Noam Chomsky is universally accepted as one of the preeminent public intellectuals of the modern era. It shows how such grammars relate to context-free grammar (Chomsky type 2) and which extensions cause the formalism to increase in power to context-sensitive grammar and beyond. This paper describes the formal power of feature grammars such as Generalised Phrase Structured Grammars (GPSG).
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