The class of all 3-valued natural conditional variants of RM3 that are Plumwood Algebras


  • Jose Miguel Blanco Faculty of Informatics, Masaryk University
  • Sandra M. Lopez University of St Andrews (Scotland) and Universidad de Salamanca (Spain)
  • Marcos M. Recio University of Salamanca



Valerie Plumwood introduced in "Some false laws of logic" a series of arguments on how the rules Exported Syllogism, Disjunctive Syllogism, Commutation, and Exportation are not acceptable. Based on this we define the class of Plumwood algebras - logical matrices that do not verify any of these theses. Afterwards we provide conditional variants of the characteristic matrix of the logic RM3 that are also Plumwood algebras. These matrices are given an axiomatization based on First Degree Entailment and are endowed with Belnap-Dunn Semantics. Finally we provide results of Soundness and Completeness in the strong sense for each of the defined variants.


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