Fachbereich Philosophie


Revision und Rechtfertigung. Eine Theorie der Theorienderung

Dissertation veröffentlicht als:
Haas, G. 2005. Revision und Rechtfertigung. Eine Theorie der Theorieänderung. Heidelberg, Synchron.

Abstract:
In the first part of the book a critical survey of the standard AGM-theory of belief revision is provided. Detailed arguments are presented to show that some of the well-known drawbacks (e.g. the recovery problem) of this model are due to its total neglect of justification structures. A similar analysis is given for Bayesianism. Having thus supported the claim that an adequate modelling of belief change mechanisms is only possible by taking justification structures into account, in the second part of the book a theory is developed that meets this demand: the JuDAS-theory (Ju_stification-based D_ynamics of A_cceptance S_ystems). First, a justification operator is characterized axiomatically. Proofs are given to show that these axioms are consistent as well as compatible with a vast range of theories of justification. Second, on the basis of such an operator mechanisms for all kinds of belief change are then characterized axiomatically. Representation theorems link these postulates with functions of belief change. It is shown that the JuDAS-theory avoids all problems discussed. In the third part of the book the abstract construction of a justification operator is fleshed out by the theory of justification proposed by Lehrer. This choice of a specific theory of justification is legitimized by means of certain conditions of adequacy in addition to the formal postulates stated. Lehrer’s theory is then formally reconstructed in order to show that it fulfills the formulated postulates. Finally, JuDAS is compared with rival approaches, e.g. Doyle’s RMS-theory. Formal proofs are given for all theorems.

Keywords: revision, theory change, justification, belief, AGM, Lehrer, JuDAS

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