David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Jack Alan Reynolds
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Journal of Philosophical Logic 27 (4):327 - 351 (1998)
The system R## of "true" relevant arithmetic is got by adding the ω-rule "Infer VxAx from AO, A1, A2, ...." to the system R# of "relevant Peano arithmetic". The rule ⊃E (or "gamma") is admissible for R##. This contrasts with the counterexample to ⊃E for R# (Friedman & Meyer, "Whither Relevant Arithmetic"). There is a Way Up part of the proof, which selects an arbitrary non-theorem C of R## and which builds by generalizing Henkin and Belnap arguments a prime theory T which still lacks C. (The key to the Way Up is a Witness Protection Program, using the ω-rule.) But T may be TOO BIG, whence there is a Way Down argument that produces a better theory TR, such that R## ⊆ TR ⊆ T. (The key to the Way Down is a Metavaluation, on which membership in T is combined with ordinary truth-functional conditions to determine TR.) The result is a theory that is Just Right, whence it never happens that A ⊃ C and A are theorems of R## but C is a non-theorem.
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References found in this work BETA
Chris Mortensen, Inconsistent Mathematics. Studia Logica.
Elliott Mendelson (1964). Introduction to Mathematical Logic. Princeton, N.J.,Van Nostrand.
Haskell B. Curry (1963/1977). Foundations of Mathematical Logic. Dover Publications.
Richard Routley & Robert K. Meyer (1972). The Semantics of Entailment — III. Journal of Philosophical Logic 1 (2):192 - 208.
J. Michael Dunn (1987). Relevant Predication 1: The Formal Theory. [REVIEW] Journal of Philosophical Logic 16 (4):347 - 381.
Citations of this work BETA
Edwin Mares (2012). Relevant Logic and the Philosophy of Mathematics. Philosophy Compass 7 (7):481-494.
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