A sieve for entailments

Journal of Philosophical Logic 9 (1):41 - 57 (1980)
The validity of an entailment has nothing to do with whether or not the components are true, false, necessary, or impossible; it has to do solely with whether or not there is a necessary connection between antecedent and consequent. Hence it is a mistake (we feel) to try to build a sieve which will “strain out” entailments from the set of material or strict “implications” present in some system of truth-functions, or of truth-functions with modality. Anderson and Belnap (1962, p. 47)
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References found in this work BETA
P. T. Geach (1970). Entailment. Philosophical Review 79 (2):237-239.
Casimir Lewy (1976). Meaning and Modality. Cambridge University Press.
Raymond M. Smullyan (1968). First-Order Logic. New York [Etc.]Springer-Verlag.
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