Is modal logic logic?

Philosophia 2 (1-2):75-84 (1972)
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Abstract

(1) modal logic is not needed, Since there are alternative accounts of modality. (2) modal logic does not function as logic even in the thinking of its advocates, As is revealed, E.G., When the semantics of modal logic is presented in an extensional metalanguage. Furthermore, (3) when a wider view is taken, One sees that modal logic treats as logical constants expressions that belong to a large and open syntactic class, Unlike other logical constants. Finally, (4) modal logic treats as sentential operators devices that function in natural language as underlying predicates. The last two points also indicate that a theory of modality making use of modal predicates is to be preferred to an account that explains away modality in terms of quantification over possible worlds

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Gilbert Harman
Princeton University

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