Three Floors for the Theory of Theory Change

In Vít Punčochář Michal Dančák (ed.), The Logica Yearbook 2013. College Publications. pp. 187-205 (2014)
Hans Rott
Universität Regensburg
The theory of theory change due to Alchourrón, Gärdenfors and Makinson ("AGM") has been widely known as being characterized by two sets of postulates, one being very weak and the other being very strong. Commenting on the three classic constructions of partial meet contraction, safe contraction and entrenchment-based construction, I argue that three intermediate levels can be distinguished that play decisive roles within the AGM theory.
Keywords theory change  partial meet contraction  safe contraction  entrenchment  interval orders  AGM
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