Nordic Online Logic Seminar: next talk on 27 February by Sven Ove Hansson

Graham Leigh graham.leigh at
Mon Feb 6 11:09:12 EST 2023

The Nordic Online Logic Seminar (NOL Seminar) is organised monthly over Zoom, with expository talks on topics of interest for the broader logic community. The seminar is open for professional or aspiring logicians and logic aficionados worldwide.

See the announcement for the next talk below. If you wish to receive the Zoom ID and password for it, as well as further announcements, please subscribe here: .

Val Goranko and Graham Leigh
NOL seminar organisers

Nordic Online Logic Seminar
Date  Monday, 27 February 2023 at 16:00 CET (UTC+1) on Zoom (details provided to seminar subscribers)
Speaker  Sven Ove Hansson (Professor of Philosophy, KTH)
Title  How to combine probabilities and full beliefs in a formal system
Abstract One of the major problems in formal epistemology is the difficulty of combining probabilistic and full (dichotomous, all-or-nothing) beliefs in one and the same formal framework. Major properties of actual human belief systems, including how they are impacted by our cognitive limitations, are used to introduce a series of desiderata for realistic models of such belief systems. This leads to a criticism of previous attempts to combine representations of both  probabilistic and full beliefs in one and the same formal model. Furthermore, a formal model is presented in which this is done differently. One of its major features is that contingent propositions can be transferred in both directions between full beliefs and lower degrees of belief, in a way that mirrors real-life acquisitions and losses of full beliefs. The subsystem consisting of full beliefs has a pattern of change that constitutes a credible system of dichotomous belief change.

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