13 citations · 36 across the 22 of their papers we have counts for
29 papers
Q-points in the Tukey order
Dilip Raghavan
Q-points are cofinal in the RK-ordering under several mild hypotheses.
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…
Adding ultrafilters to Shelah's model for no nowhere dense ultrafilters
Dilip Raghavan, Juris Steprāns
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…
Order structure of P-point ultrafilters and their relatives
Borisa Kuzeljevic, Dilip Raghavan
We survey some recent results about the order structure of various kinds of ultrafilters. More precisely, we study Rudin-Keisler and Tukey reducibility in classes of selective, sta…
Stable ordered-union versus selective ultrafilters
Dilip Raghavan, Juris Steprans
It will be shown to be consistent that there are at least two non-isomorphic selective ultrafilters, but no stable ordered-union ultrafilters. This answers a question of Blass from…
Combinatorial properties of MAD families
Jörg Brendle, Osvaldo Guzmán, Michael Hrušák +1
We study some strong combinatorial properties of families. An ideal is Shelah-Steprāns if for every set there is an…