O. Guzmán

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math.LO2021

HL ideals and Sacks indestructible ultrafilters

David Chodounský, Osvaldo Guzmán, Michael Hrušák

We study ultrafilters on countable sets and reaping families which are indestructible by Sacks forcing. We deal with the combinatorial characterization of such families and we prov…

math.LO2019

On $R$ -embeddability of almost disjoint families and Akemann-Doner C*-algebras

Osvaldo Guzmán, Michael Hrušák, Piotr Koszmider

An almost disjoint family $A$ of subsets of $N$ is said to be $R$ -embeddable if there is a function $f : N \to R$ such that the sets $…

HL ideals and Sacks indestructible ultrafilters

On R-embeddability of almost disjoint families and Akemann-Doner C*-algebras

On $R$ -embeddability of almost disjoint families and Akemann-Doner C*-algebras