Definable maximal cofinitary groups of intermediate size

11 Apr 2019  ·  Fischer Vera, Friedman Sy David, Schrittesser David, Törnquist Asger ·

Using almost disjoint coding, we show that for each $1<M<N<\omega$ consistently $\mathfrak{d}=\mathfrak{a}_g=\aleph_M<\mathfrak{c}=\aleph_N$, where $\mathfrak{a}_g=\aleph_M$ is witnessed by a $\Pi^1_2$ maximal cofinitary group...

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Logic