A survey of multiple contractions

@article{Fuhrmann1994ASO,
  title={A survey of multiple contractions},
  author={Andr{\'e} Fuhrmann and Sven Ove Hansson},
  journal={Journal of Logic, Language and Information},
  year={1994},
  volume={3},
  pages={39-75}
}
The AGM theory of belief contraction is extended tomultiple contraction, i.e. to contraction by a set of sentences rather than by a single sentence. There are two major variants: Inpackage contraction all the sentences must be removed from the belief set, whereas inchoice contraction it is sufficient that at least one of them is removed. Constructions of both types of multiple contraction are offered and axiomatically characterized. Neither package nor choice contraction can in general be… 
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