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Properties of Topologies for the Continuous Representability of All Weakly Continuous Preorders

Gianni Bosi (gianni.bosi@deams.units.it), Laura Franzoi and Gabriele Sbaiz
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Gianni Bosi: Department of Economics, Business, Mathematics and Statistics, University of Trieste, Via A. Valerio 4/1, 34127 Trieste, Italy
Laura Franzoi: Department of Economics, Business, Mathematics and Statistics, University of Trieste, Via A. Valerio 4/1, 34127 Trieste, Italy
Gabriele Sbaiz: Department of Economics, Business, Mathematics and Statistics, University of Trieste, Via A. Valerio 4/1, 34127 Trieste, Italy

Mathematics, 2023, vol. 11, issue 20, 1-9

Abstract: We investigate properties of strongly useful topologies , i.e., topologies with respect to which every weakly continuous preorder admits a continuous order-preserving function. In particular, we prove that a topology is strongly useful provided that the topology generated by every family of separable systems is countable. Focusing on normal Hausdorff topologies, whose consideration is fully justified and not restrictive at all, we show that strongly useful topologies are hereditarily separable on closed sets, and we identify a simple condition under which the Lindelöf property holds.

Keywords: strongly useful topology; weakly continuous preorder; hereditarily separable topology; Lindelöf property (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2023
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