Making beliefs coherentl. The subtraction and addition strategies

Abstract
The notion of epistemic coherence is interpreted as involving not only consistency but also stability. The problem how to consolidate a belief system, i.e., revise it so that it becomes coherent, is studied axiomatically as well as in terms of set-theoretical constructions. Representation theorems are given for subtractive consolidation (where coherence is obtained by deleting beliefs) and additive consolidation (where coherence is obtained by adding beliefs).
Keywords Belief revision  consolidation  coherence  stability
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Sven Ove Hansson (2013). Repertoire Contraction. Journal of Logic, Language and Information 22 (1):1-21.
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