Absolute $\mathcal F$-Borel classes
Tom 243 / 2018
Fundamenta Mathematicae 243 (2018), 85-107
MSC: Primary 54H05; Secondary 54G20.
DOI: 10.4064/fm412-10-2017
Opublikowany online: 23 March 2018
Streszczenie
We investigate and compare $\mathcal F$-Borel classes and absolute $\mathcal F$-Borel classes. We provide precise examples distinguishing these two hierarchies. We also show that for separable metrizable spaces, $\mathcal F$-Borel classes are automatically absolute.
