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The logical meaning of Expansion

Daniel Lehmann
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Abstract

The Expansion property considered by researchers in Social Choice is shown to correspond to a logical property of nonmonotonic consequence relations that is the {\em pure}, i.e., not involving connectives, version of a previously known weak rationality condition. The assumption that the union of two definable sets of models is definable is needed for the soundness part of the result.

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Daniel Lehmann. 2002-02-20. The logical meaning of Expansion. https://arxiv.org/abs/cs/0202033

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