2017 | 26 | 2 | 207–235
Article title

Bochvar's Three-Valued Logic and Literal Paralogics: Their Lattice and Functional Equivalence

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In the present paper, various features of the class of propositional literal paralogics are considered. Literal paralogics are logics in which the paraproperties such as paraconsistence, paracompleteness and paranormality, occur only at the level of literals; that is, formulas that are propositional letters or their iterated negations. We begin by analyzing Bochvar’s three-valued nonsense logic B3 , which includes two isomorphs of the propositional classical logic CPC. The combination of these two ‘strong’ isomorphs leads to the construction of two famous paralogics P1 and I1, which are functionally equivalent. Moreover, each of these logics is functionally equivalent to the fragment of logic B3 consisting of external formulas only. In conclusion, we structure a four-element lattice of three-valued paralogics with respect to the possession of paraproperties.
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  • Department of Logic, Institute of Philosophy, Russian Academy of Sciences, Goncharnaya 12/1, Moscow, 109240, Russian Federation,
  • Department of Logic, Institute of Philosophy, Russian Academy of Sciences, Goncharnaya 12/1, Moscow, 109240, Russian Federation,
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