The AGM postulates (named after the names of their proponents, Alchourrón, Gärdenfors, and Makinson) are properties that an operator that performs revision should satisfy in order for that operator to be considered rational.
The Theory of Conceptual Spaces is a theory about concept representation proposed by Peter Gärdenfors.
In belief revision he created the AGM account of theory change with Carlos Alchourrón and Peter Gärdenfors.
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