Journal
MATHEMATICS
Volume 11, Issue 20, Pages -Publisher
MDPI
DOI: 10.3390/math11204335
Keywords
strongly useful topology; weakly continuous preorder; hereditarily separable topology; Lindelof property
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We investigate the properties of strongly useful topologies, proving that a topology is strongly useful if the topology generated by every family of separable systems is countable. Focusing on normal Hausdorff topologies, we show that strongly useful topologies are hereditarily separable on closed sets and identify a simple condition for the Lindelof property to hold.
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 Lindelof property holds.
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