Abstract
This paper deals with some strengthenings of the non-directional product-free Lambek calculus by means of additional structural rules. In fact, the rules contraction and expansion are restricted to basic types. For each of the presented systems the usual proof-theoretic notions are discussed, some new concepts especially designed for these calculi are introduced reflecting their intermediate position between the weaker and the stronger sequent-systems.
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This work was supported by the Research Council of Slovenija
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Prijatelj, A. Lambek calculus with restricted contraction and expansion. Studia Logica 51, 125–143 (1992). https://doi.org/10.1007/BF00370335
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DOI: https://doi.org/10.1007/BF00370335