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Soft almost disjoint families |
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| Authors: | Paul J. Szeptycki |
| Affiliation: | School of Analytic Studies and Information Technology, York University, Toronto, Ontario, Canada M3J 1P3 |
| Abstract: | An almost disjoint family  is said to be soft if there is an infinite set that meets each  in a nonempty but finite set. We consider the associated cardinal invariant defined to be the minimal cardinality of an almost disjoint family that is not soft. We show that this cardinal coincides with J. Brendle's cardinal  . |
| Keywords: | Almost disjoint families unbounded sets weakly separated property (a) |
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