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Characterization of (semi-)Eberlein compacta using retractional skeletons
We study retractions associated to suitable models in compact spaces admitting a retractional skeleton and find several interesting consequences. Most importantly, we provide a new characterization of Valdivia compacta using the notion of retractional skeletons, which seems to be helpful when characterizing their subclasses. Further, we characterize Eberlein and semi-Eberlein compacta in terms of retractional skeletons and show that our new characterizations give an alternative proof of thedoi:10.4064/sm200916-28-6 fatcat:smgvkwupv5c5jffsomrbxjkyk4