Avoiding Omnidoxasticity in Logics of Belief: A Reply to MacPherson

O'Hara, Kieron, Reichgelt, Han and Shadbolt, Nigel (1995) Avoiding Omnidoxasticity in Logics of Belief: A Reply to MacPherson. Notre Dame Journal of Formal Logic, 36, (3), 475-95.


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In recent work MacPherson argues that the standard method of modeling belief logically, as a necessity operator in a modal logic, is doomed to fail. The problem with normal modal logics as logics of belief is that they treat believers as "ideal" in unrealistic ways (i.e., as omnidoxastic); however, similar problems re-emerge for candidate non-normal logics. The authors argue that logics used to model belief in artificial intelligence (AI) are also flawed in this way. But for AI systems, omnidoxasticity is impossible because of their finite nature, and this fact can be exploited to produce operational models of fallible belief. The relevance of this point to various philosophical views about belief is discussed.

Item Type: Article
Additional Information: Commentary On: B. MacPherson, 'Is it possible belief isn't necessary?' Notre Dame Journal of Formal Logic 34, 12-28
Keywords: belief logics, artificial intelligence, omnidoxasticity, modal logic, epistemic logic, operational models of belief
Divisions : Faculty of Physical Sciences and Engineering > Electronics and Computer Science > Web & Internet Science
ePrint ID: 254157
Accepted Date and Publication Date:
Date Deposited: 04 Nov 2000
Last Modified: 31 Mar 2016 13:55
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/254157

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