Journal of Symbolic Logic

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

Asger Törnquist

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

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J. Symbolic Logic Volume 78, Issue 4 (2013), 1181-1182.

First available in Project Euclid: 5 January 2014

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Törnquist, Asger. $\Sigma^1_2$ and $\Pi^1_1$ mad families. J. Symbolic Logic 78 (2013), no. 4, 1181--1182. doi:10.2178/jsl.7804080.

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