A Survey on Language Completeness of the Lambek Calculus and Its Extensions
摘要
The most natural class of models for the Lambek calculus, according to its linguistic applications, is formed by models on algebras of formal languages, or L-models for short. While the Lambek calculus is known to be complete w.r.t. this class of models (Pentus 1995), its natural extensions are often incomplete. We give a survey of known (in)completeness results and present a couple of new ones.