Michael Spaces and Selective Ultrafilters

Seminarium: 
Topologia
Osoba referująca: 
Arturo Martinez Celis (University of Wrocław)
Data: 
wtorek, 30. Listopad 2021 - 17:00
Sala: 
605
Opis: 
A Lindelöf space X is Michael if it has a non-Lindelöf product with the space of irrational numbers. The existence of these kinds of spaces using only the standard axioms of ZFC is still unknown. We will look into some of the combinatorics related to this problem and discuss its relationships with Selective Ultrafilters.