English article usage as a window on the meanings ofsame,identicalandsimilar
We propose an explanation for a traditional puzzle in English linguistics involving the use of articles with the nominal modifierssame,identicalandsimilar.Samecan only take the definite articlethe, whereasidenticalandsimilartake eithertheora. We argue that there is a fundamental difference in the manner in which a comparison is made with these modifiers.Identicalandsimilarinvolve direct comparisons between at least two entities and an assertion of either full property matching (identical), or partial property matching (similar). The comparison withsameproceeds differently: what is compared is not linguistic entities directly, but definite descriptions of these entities that can be derived through logical entailments.John and Mary live in the same houseentailsthe house that John lives in is the (same) house that Mary lives in. There must be a pragmatic equivalence between these entailed definite descriptions, ranging from full referential equivalence to a possibly quite minimal overlap in semantic and real-world properties shared by distinct referents. These differences in meaning and article co-occurrence reveal the sensitivity of syntax to semantic and pragmatic properties, without which all and only the grammatical sentences of a language cannot be predicted.