into a new theory, now known as APG. APG itself was developed by Johnson and Postal in the late 1970s, but was not published until 1980. APG takes grammatical relations, the graph theory notion of an arc, and two operations (SPONSOR and ERASE) as primitives, with all other rules being derived (many of them mathematically, rather than empirically).

Postulates

In contrast to the generative-enumerative (proof-theoretic) approach to syntax assumed by transformational grammar, arc pair grammar takes a model-theoretic approach. In

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