Comments on some completeness theorems of Urquhart and méndez & Salto

Journal of Philosophical Logic 30 (1):51-55 (2001)
Abstract
Urquhart and Méndez and Salto claim to establish completeness theorems for the system C and two of its negation extensions. In this note, we do the following three things: (1) provide a counterexample to all of these alleged completeness theorems, (2) attempt to diagnose the mistakes in the reported completeness proofs, and (3) provide complete axiomatizations of the desired systems
Keywords completeness  substructural  logic  many-valued  matrix
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