Thursday, January 15, 2026 - 11:00 to 12:00
Zoom link: https://pitt.zoom.us/j/96207413067
(meeting id 962 0741 3067)
Abstract or Additional Information
We describe a space that is regular but not completely regular, but only barely so:
all closed sets are G_delta -sets and every singleton is a zero-set.
This is related to a question about how the lattice of cozero-sets is situated in the full lattice of open sets in a space.