David Schrittesser

activity

20142026

most citedA co-analytic Cohen indestructible maximal cofinitary group

11 citations · 73 across the 28 of their papers we have counts for

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Showing 2016Show all

2 papers · 1 filter

math.LO2016★ 3 cited

Definable discrete sets with large continuum

David Schrittesser

Let $R$ be a $Σ_{1}^{1}$ binary relation and call a set $R$ -discrete iff no two distinct of its elements are $R$ -related. We show that in the extension of $\…

math.LO2016★ 11 cited

A co-analytic Cohen indestructible maximal cofinitary group

Vera Fischer, David Schrittesser, Asger Törnquist

Assuming that every set is constructible, we find a $Π_{1}^{1}$ maximal cofinitary group of permutations of $N$ which is indestructible by Cohen forcing. Thus we show that the…