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math.LO2016
Q
Joerg Brendle
A Q-set is an uncountable set of reals all of whose subsets are relative sets. We prove that, for an arbitrary uncountable cardinal kappa, there is consistently a Q-set of si…
math.LO2016
Cofinalities of Marczewski-like ideals
Joerg Brendle, Yurii Khomskii, Wolfgang Wohofsky
We show that the cofinalities of both the Miller ideal m^0 (the sigma-ideal naturally related to Miller forcing) and the Laver ideal ell^0 (related to Laver forcing) are larger tha…