Abstract
The Lambek-Grishin calculus LG is the symmetric extension of the non-associative Lambek calculus NL. In this paper we prove that the derivability problem for the product-free fragment of LG is NP-complete, thus improving on Bransen (2010) where this is shown for LG with product.
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Bransen, J. (2011). The Product-Free Lambek-Grishin Calculus Is NP-Complete. In: Pogodalla, S., Prost, JP. (eds) Logical Aspects of Computational Linguistics. LACL 2011. Lecture Notes in Computer Science(), vol 6736. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-22221-4_4
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