$\Sigma^1_2$ and $\Pi^1_1$ mad families

arxiv: 1310.3250 · v1 · pith:NC6YBVOPnew · submitted 2013-10-11 · 🧮 math.LO

Sigma¹₂ and Pi¹₁ mad families

Asger T\"ornquist This is my paper

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keywords familysigmathereaffirmativeanswerbrendlefamiliesfollowing

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We answer in the affirmative the following question of J\"org Brendle: If there is a $\Sigma^1_2$ mad family, is there then a $\Pi^1_1$ mad family?

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