Abstract
The idea that it might be worth investigating the logic of theory change, in the sense of the present paper, is due, independently to Carlos Alchourrón and David Makinson on the one hand and to Peter Gärdenfors on the other. Their joint paper [1] is the most substantial contribution to this area to date. The idea is that if T is a theory (which we think of as a set of formulae) and A is a formula, then T + A is a new theory, the theory which results if A is “added” to T. What makes this notion problematic — and interesting — is that this operation is supposed to be defined even when A is inconsistent with T.
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References
Alchourrón, Carlos E., Gärdenfors, Peter and Makinson, David, “On the logic of theory change”, The journal of symbolic logic 50:510–530 (1985).
Gärdenfors, Peter, “Conditionals and changes of belief”, Acta philosophica fennica 30:133–153 (1978).
Lewis, David K., Counterfactuals, Harvard University Press, Cambridge, Mass., 1973.
Segerberg, Krister, “On the logic of small changes in theories I”, Acta philosophica fennica, to appear.
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© 1987 Plenum Press, New York
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Segerberg, K. (1987). On the Logic of Small Changes in Theories II. In: Skordev, D.G. (eds) Mathematical Logic and Its Applications. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0897-3_13
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DOI: https://doi.org/10.1007/978-1-4613-0897-3_13
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