Journal of Symbolic Logic

Invariance properties of almost disjoint families

M. Arciga-Alejandre, M. Hrušák, and C. Martinez-Ranero

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We answer a question of Garcia-Ferreira and Hrušák by consistently constructing a MAD family maximal in the Katětov order. We also answer several questions of Garcia-Ferreira.

Article information

J. Symbolic Logic, Volume 78, Issue 3 (2013), 989-999.

First available in Project Euclid: 6 January 2014

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Zentralblatt MATH identifier

Primary: primary set theory; secondary logic

MAD family group of permutations Katetov ideals cofinitary group


Arciga-Alejandre, M.; Hrušák, M.; Martinez-Ranero, C. Invariance properties of almost disjoint families. J. Symbolic Logic 78 (2013), no. 3, 989--999. doi:10.2178/jsl.7803160.

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