Product-Free Lambek Calculus Is NP-Complete

  title={Product-Free Lambek Calculus Is NP-Complete},
  author={Yury Savateev},
In this paper we prove that the derivability problems for product-free Lambek calculus and product-free Lambek calculus allowing empty premises are NPcomplete. Also we introduce a new derivability characterization for these calculi. 

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