11 citations · 22 across the 8 of their papers we have counts for
8 papers
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…
Set theory and von Neumann algebras
Asger Törnquist, Martino Lupini
These are the notes from Asger Törnquist's Appalachian Set Theory lectures at Carnegie Mellon University. They form a chapter in the LMS lecture notes series 406.
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…
The Borel complexity of von Neumann equivalence
Inessa Epstein, Asger Tornquist
We prove that for a countable discrete group containing a copy of the free group $\F_n$, for some , as a normal subgroup, the equivalence relations of conjug…
Turbulence, orbit equivalence, and the classification of nuclear C*-algebras
Ilijas Farah, Asger Tornquist, Andrew S. Toms
We bound the Borel cardinality of the isomorphism relation for nuclear simple separable C*-algebras: It is turbulent, yet Borel reducible to the action of the automorphism group of…