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Continuity and Continuous Multi-utility Representations of Nontotal Preorders: Some Considerations Concerning Restrictiveness

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Mathematical Topics on Representations of Ordered Structures and Utility Theory

Part of the book series: Studies in Systems, Decision and Control ((SSDC,volume 263))

Abstract

A continuous multi-utility fully represents a not necessarily total preorder on a topological space by means of a family of continuous increasing functions. While it is very attractive for obvious reasons, and therefore it has been applied in different contexts, such as expected utility for example, it is nevertheless very restrictive. In this paper we first present some general characterizations of the existence of a continuous order-preserving function, and respectively a continuous multi-utility representation, for a preorder on a topological space. We then illustrate the restrictiveness associated to the existence of a continuous multi-utility representation, by referring both to appropriate continuity conditions which must be satisfied by a preorder admitting this kind of representation, and to the Hausdorff property of the quotient order topology corresponding to the equivalence relation induced by the preorder. We prove a very restrictive result, which may concisely described as follows: the continuous multi-utility representability of all closed (or equivalently weakly continuous) preorders on a topological space is equivalent to the requirement according to which the quotient topology with respect to the equivalence corresponding to the coincidence of all continuous functions is discrete.

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Authors and Affiliations

  1. DEAMS, University of Trieste, via Università 1, 34123, Trieste, Italy

    Gianni Bosi

  2. DEM, University of Brescia, Contrada Santa Chiara 50, 25122, Brescia, Italy

    Magalì Zuanon

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  1. Gianni Bosi
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  2. Magalì Zuanon
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Correspondence to Gianni Bosi .

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Editors and Affiliations

  1. Dipartimento di Scienze Economiche, Aziendali, Matematiche e Statistiche, Università degli Studi di Trieste, Trieste, Italy

    Gianni Bosi

  2. Departamento de Estadística, Informática y Matemáticas, Universidad Pública de Navarra, Pamplona, Navarra, Spain

    María J. Campión

  3. Facultad de Economía y Empresa, Departamento de Análisis Económico, Universidad de Zaragoza, Zaragoza, Spain

    Juan C. Candeal

  4. Departamento de Estadística, Informática y Matemáticas, Universidad Pública de Navarra, Pamplona, Spain

    Esteban Indurain

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Bosi, G., Zuanon, M. (2020). Continuity and Continuous Multi-utility Representations of Nontotal Preorders: Some Considerations Concerning Restrictiveness. In: Bosi, G., Campión, M., Candeal, J., Indurain, E. (eds) Mathematical Topics on Representations of Ordered Structures and Utility Theory. Studies in Systems, Decision and Control, vol 263. Springer, Cham. https://doi.org/10.1007/978-3-030-34226-5_11

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