3 papers
math.LO2024
Q-points in the Tukey order
Dilip Raghavan
Q-points are cofinal in the RK-ordering under several mild hypotheses.
math.LO2024
Borel Order Dimension
Dilip Raghavan, Ming Xiao
We introduce and study a notion of Borel order dimension for Borel quasi orders. It will be shown that this notion is closely related to the notion of Borel dichromatic number for…
math.LO2024
Adding ultrafilters to Shelah's model for no nowhere dense ultrafilters
Dilip Raghavan, Juris SteprÄns
We exhibit a forcing for producing a model with no nowhere dense ultrafilters that satisfies the full Sacks Property. By interleaving this forcing with other forcing notions, a mod…