11 citations · 22 across the 8 of their papers we have counts for
4 papers · 1 filter
Good projective witnesses
Vera Fischer, Sy David Friedman, David Schrittesser +1
We develop a new forcing notion for adjoining self-coding cofinitary permutations and use it to show that consistently, the minimal cardinality of a maxima…
A co-analytic Cohen indestructible maximal cofinitary group
Vera Fischer, David Schrittesser, Asger Törnquist
Assuming that every set is constructible, we find a maximal cofinitary group of permutations of which is indestructible by Cohen forcing. Thus we show that the…
The counterparts to statements that are equivalent to the Continuum Hypothesis
Asger Tornquist, William Weiss
We consider natural definable analogues of many of the classical statements that have been shown to be equivalent to CH. It is shown that these analogues are equiva…
Borel reducibility and classification of von Neumann algebras
Roman Sasyk, Asger Tornquist
We announce some new results regarding the classification problem for separable von Neumann algebras. Our results are obtained by applying the notion of Borel reducibility and Hjor…