@article{42d45beea86e4380b86045286d62ddb7,
title = "Products of Lindel{\"o}f spaces with points Gδ ",
abstract = "We show that if CH holds and either (i) there exists an ω1-Kurepa tree, or (ii) □(ω2) holds, then there are regular T1 Lindel{\"o}f spaces X0 and X1 with points Gδ such that the extent of X0×X1 is strictly greater than 2ω.",
keywords = "Aronszajn tree, Kurepa tree, Lindel{\"o}f space, Points G, Square principle",
author = "Toshimichi Usuba",
note = "Funding Information: The author would like to thank the referee for many valuable comments. This research was supported by JSPS KAKENHI Grant Nos. 18K03403 and 18K03404 . Publisher Copyright: {\textcopyright} 2018",
year = "2019",
month = feb,
day = "1",
doi = "10.1016/j.topol.2018.11.019",
language = "English",
volume = "252",
pages = "90--96",
journal = "Topology and its Applications",
issn = "0166-8641",
publisher = "Elsevier",
}