The Inextricable Link Between Conditionals and Logical Consequence

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Abstract
There is a profound, but frequently ignored, relationship between the classical conception of logical consequence and the material implication. The first repeats the patterns of the latter, but with a wider modal reach. This relationship suggests that there should be also a connection between the notion of logical consequence and the conditional connective of any given logical system. This implies, among other things, that it is incoherent to propose alternatives to the material implication while maintaining the classical conception of logical consequence. The other important implication is that we need to posit different conceptions of logical consequence that are consistent with different theories of conditionals in order to evaluate their relative merits from new and unexplored angles. As a pilot study of this research program, we evaluate two new notions of logical consequence motivated by conditional-assertion theory and possible world theories. Those alternatives are compared unfavourably with the classical conception of logical consequence.
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First archival date: 2020-07-27
Latest version: 14 (2020-08-18)
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2020-07-27

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