Displaying similar documents to “Natural deduction and sequent typed lambda calculus.”

Involutive Nonassociative Lambek Calculus: Sequent Systems and Complexity

Wojciech Buszkowski (2017)

Bulletin of the Section of Logic

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In [5] we study Nonassociative Lambek Calculus (NL) augmented with De Morgan negation, satisfying the double negation and contraposition laws. This logic, introduced by de Grooté and Lamarche [10], is called Classical Non-Associative Lambek Calculus (CNL). Here we study a weaker logic InNL, i.e. NL with two involutive negations. We present a one-sided sequent system for InNL, admitting cut elimination. We also prove that InNL is PTIME.