TAILIEUCHUNG - Báo cáo khoa học: "THE LOGICAL ANALYSIS OF LEXICAL AMBIGUITY"

Theodes of semantic interpretation which wish to capture as many generalizations as possible must face up to the manifoldly ambiguous and contextually dependent nature of word meaning? In this paper I present a two-level scheme of semantic interpretation in which the first level deals with the semantic consequences of'syntactic structure and the second with the choice of word meaning. On the first level the meanings of ambiguous words, pronominal references, nominal compounds and metonomies are not treated as fixed, but are instead represented by free variables which range over predicates and functions. . | THE LOGICAL ANALYSIS OF LEXICAL AMBIGUITY David Stallard BBN Laboratories Inc. 10 Moulton St. Cambridge Mass. 02238 Abstract Theories of semantic interpretation which wish to capture as many generalizations as possible must face up to the manifoldly ambiguous and contextually dependent nature of word In this paper I present a two-level scheme of semantic interpretation in which the first level deals with the semantic consequences of-syntactic structure and the second with the choice of word meaning. On the first level the meanings of ambiguous words pronominal references nominal compounds and metonomies are not treated as fixed but are Instead represented by free variables which range over predicates and functions The context-dependence of lexical meaning is dealt with by the second level a constraint propagation process which attempts to assign values to these variables on the basis of the logical coherence of the overall result. In so doing It makes use of a set of polysemy operators which map between lexical senses thus making a potentially indefinite number of related senses available. 1 INTRODUCTION LEXICAL ASSOCIATION IN A COMPOSITIONAL SEMANTICS A tenet now held with some force among formal semanticists is that the meaning of a complex naturallanguage expression should be a function of just two things the meanings of the parts of the expression and the syntactic rule used to form the expression out of those parts. Systems such as Montague Grammar 9 give phrases like former senator compositional treatments by first translating them to an expression of intensional logic and then giving this expression a model-theoretic interpretation in the usual way. The practical relevance of this goal to work in natural language processing is clear for any application domain maximum coverage could be obtained from the same domain-independent set of rules needing only to add the relevant entries with their primitive associations of meaning to the lexicon. The work

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• LEXICAL AMBIGUITY
• David Stallard
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