The american plan completed: Alternative classical-style semantics, without stars, for relevant and paraconsistent logics

Studia Logica 43 (1-2):131 - 158 (1984)
Abstract
American-plan semantics with 4 values 1, 0, { {1, 0}} {{}}, interpretable as True, False, Both and Neither, are furnished for a range of logics, including relevant affixing systems. The evaluation rules for extensional connectives take a classical form: in particular, those for negation assume the form 1 (A, a) iff 0 (A, a) and 0 (A, a) iff 1 (A, a), so eliminating the star function *, on which much criticism of relevant logic semantics has focussed. The cost of these classical features is a further relation (or operation), required in evaluating falsity assignments of implication formulae.Two styles of 4 valued relational semantics are developed; firstly a semantics using notions of double truth and double validity for basic relevant systemB and some extensions of it; and secondly, since the first semantics makes heavy weather of validating negation principles such as Contraposition, a reduced semantics using more complex implicational rules for relevant systemC and various of its extensions. To deal satisfactorily with elite systemsR,E andT, however, further complication is inevitable; and a relation of mateship (suggested by the Australian plan) is introduced to permit cross-over from 1 to 0 values and vice versa.
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References found in this work BETA
J. Michael Dunn (1976). Quantification and RM. Studia Logica 35 (3):315 - 322.
Citations of this work BETA
Greg Restall & Tony Roy (2009). On Permutation in Simplified Semantics. Journal of Philosophical Logic 38 (3):333 - 341.
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