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math.LO2019
On -embeddability of almost disjoint families and Akemann-Doner C*-algebras
Osvaldo Guzmán, Michael Hrušák, Piotr Koszmider
An almost disjoint family of subsets of is said to be -embeddable if there is a function such that the sets $…
math.LO2017
No minimal tall Borel ideal in the Katětov order
Jan Grebík, Michael Hrušák
Answering a question of the second listed author we show that there is no tall Borel ideal minimal among all tall Borel ideals in the Katětov order.