Synthese 193 (11) (2016)

Abstract
“The Craft of Formal Logic” is Arthur Prior’s unpublished textbook, written in 1950–51, in which he developed a theory of modality as quantification over possible worlds-like objects. This theory predates most of the prominent pioneering texts in possible worlds semantics and anticipates the significance of its basic concept in modal logic. Prior explicitly defines modal operators as quantifiers of ‘entities’ with modal character. Although he talks about these ‘entities’ only informally, and hesitates how to name them, using alternately the phrases ‘possible states of affairs’, ‘chances’, ‘cases’ or ‘peculiar objects’, he is nevertheless very clear that they should be the fundamental concept of any theory of modality as a form of quantity. Without the assumption that modal operators quantify over such modal objects, the modal system will be incapable of distinguishing an actually true proposition from a necessarily true one. Due to the fact that Prior never made any direct reference to this theory in his subsequently published papers, it remained largely unknown. The comparison of “The Craft” with some of his papers on tense logic suggests that this early theory of modality underlies his later work on temporality
Keywords Arthur Prior’s unpublished manuscript  The Craft of Formal Logic  Arthur Prior’s early modal logic  Theory of modality  Possible worlds  History of possible world semantics
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Reprint years 2016
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DOI 10.1007/s11229-015-0912-0
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References found in this work BETA

Past, Present and Future.Arthur Prior - 1967 - Clarendon Press.
Formal Logic.Arthur N. Prior & Norman Prior - 1955 - Oxford University Press.
The Genesis of Possible Worlds Semantics.B. Jack Copeland - 2002 - Journal of Philosophical Logic 31 (2):99-137.
The Syntax of Time-Distinctions.A. N. Prior - 1958 - Franciscan Studies 18 (2):105-120.

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