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  1. A Broomean Model of Rationality and Reasoning.Franz Dietrich, Antonios Staras & Robert Sugden - 2019 - Journal of Philosophy 116 (11):585-614.
    John Broome has developed an account of rationality and reasoning which gives philosophical foundations for choice theory and the psychology of rational agents. We formalize his account into a model that differs from ordinary choice-theoretic models through focusing on psychology and the reasoning process. Within that model, we ask Broome’s central question of whether reasoning can make us more rational: whether it allows us to acquire transitive preferences, consistent beliefs, non-akratic intentions, and so on. We identify three structural types of (...)
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  2. Beyond Belief: Logic in Multiple Attitudes.Franz Dietrich, Antonios Staras & Robert Sugden - manuscript
    Choice-theoretic and philosophical accounts of rationality and reasoning address a multi-attitude psychology, including beliefs, desires, intentions, etc. By contrast, logicians traditionally focus on beliefs only. Yet there is 'logic' in multiple attitudes. We propose a generalization of the three standard logical requirements on beliefs -- consistency, completeness, and deductive closedness -- towards multiple attitudes. How do these three logical requirements relate to rational requirements, e.g., of transitive preferences or non-akratic intentions? We establish a systematic correspondence: each logical requirement (consistency, completeness, (...)
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  3. Reasoning in Versus About Attitudes: Forming Versus Discovering One's Mental States.Franz Dietrich & Antonios Staras - manuscript
    One reasons not just in beliefs, but also in intentions, preferences, and other attitudes. For instance, one forms preferences from preferences, or intentions from beliefs and preferences. Formal logic has proved useful for modelling reasoning in beliefs -- a process of forming beliefs from beliefs. Can logic also model reasoning in multiple attitudes? We identify principled obstacles. Logic can model reasoning about one's attitudes -- a process of discovering attitudes -- but not reasoning in attitudes -- a process of forming (...)
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  4. Savage’s Response to Allais as Broomean Reasoning.Franz Dietrich, Antonios Staras & Robert Sugden - 2020 - Journal of Economic Methodology 28 (2).
    Savage famously contravened his own theory when first confronting the Allais Paradox, but then convinced himself that he had made an error. We examine the formal structure of Savage’s ‘error-correcting’ reasoning in the light of (i) behavioural economists’ claims to identify the latent preferences of individuals who violate conventional rationality requirements and (ii) Broome’s critique of arguments which presuppose that rationality requirements can be achieved through reasoning. We argue that Savage’s reasoning is not vulnerable to Broome’s critique, but does not (...)
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