Mathematics – Logic
Scientific paper
2006-11-24
Mathematics
Logic
Scientific paper
Given a family $F$ of pairwise almost disjoint sets on a countable set $S$, we study families $F^+$ of maximal almost disjoint (mad) sets extending $F$. We define $a^+(F)$ to be the minimal possible cardinality of $F^+\setminus F$ for such $F^+$, and $a^+(\kappa)=\sup\{a^+(F): |F| \leq \kappa \}$. We show that all infinite cardinal less than or equal to the continuum continuum can be represented as $a^+(F)$ for some almost disjoint $F$ and that the inequalities $\aleph_1=a
Fuchino Sakaé
Geschke Stefan
Soukup Lajos
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