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Recoverability of choice functions and binary relations: some duality results

  • Kotaro Suzumura

    ()

  • Yongsheng Xu

    ()

Banerjee and Pattanaik (1996) proved a theorem that the maximal set with respect to a quasi-ordering can be fully recovered by defining the greatest sets with respect to each and every ordering extension thereof and taking their union. Donaldson and Weymark (1998) proved a theorem that a quasi-ordering can be fully recovered by taking the intersection of all the ordering extensions thereof. These recoverability theorems are obviously related, but their exact relationship has never been clarified in the literature. This paper examines the issue of choice-functional recoverability and relational recoverability in a general framework, and establishes several remarkable duality relationships. Copyright Springer-Verlag 2003

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File URL: http://hdl.handle.net/10.1007/s00355-003-0199-9
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Article provided by Springer in its journal Social Choice and Welfare.

Volume (Year): 21 (2003)
Issue (Month): 1 (08)
Pages: 21-37

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Handle: RePEc:spr:sochwe:v:21:y:2003:i:1:p:21-37
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