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Boulesic-Doxastic Logic
Stockholm University, Faculty of Humanities, Department of Philosophy.
Number of Authors: 12019 (English)In: Australasian Journal of Logic, ISSN 1448-5052, Vol. 16, no 3, p. 83-132Article in journal (Refereed) Published
Abstract [en]

In this paper, I will develop a set of boulesic-doxastic tableau systems and prove that they are sound and complete. Boulesic-doxastic logic consists of two main parts: a boulesic part and a doxastic part. By 'boulesic logic' I mean 'the logic of the will', and by `doxastic logic' I mean 'the logic of belief'. The first part deals with 'boulesic' concepts, expressions, sentences, arguments and theorems. I will concentrate on two types of boulesic expression: 'individual x wants it to be the case that' and 'individual x accepts that it is the case that'. The second part deals with 'doxastic' concepts, expressions, sentences, arguments and theorems. I will concentrate on two types of doxastic expression: 'individual x believes that' and 'it is imaginable to individual x that'. Boulesic-doxastic logic investigates how these concepts are related to each other. Boulesic logic is a new kind of logic. Doxastic logic has been around for a while, but the approach to this branch of logic in this paper is new. Each system is combined with modal logic with two kinds of modal operators for historical and absolute necessity and predicate logic with necessary identity and 'possibilise quantifiers. I use a kind of possible world semantics to describe the systems semantically. I also sketch out how our basic language can be extended with propositional quantifiers. All the systems developed in this paper are new.

Place, publisher, year, edition, pages
2019. Vol. 16, no 3, p. 83-132
Keywords [en]
Boulesic-doxastic logic, Boulesic logic, doxastic logic, modal logic, semantic tableaux, practical rationality
National Category
Computer and Information Sciences
Identifiers
URN: urn:nbn:se:su:diva-171204DOI: 10.26686/ajl.v16i3.4158ISI: 000472772600003OAI: oai:DiVA.org:su-171204DiVA, id: diva2:1339286
Available from: 2019-07-28 Created: 2019-07-28 Last updated: 2019-07-28Bibliographically approved

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