Mathematics – Logic
Scientific paper
2004-06-22
Mathematics
Logic
Scientific paper
For an infinite cardinal mu, MAD(mu) denotes the set of all cardinalities of nontrivial maximal almost disjoint families over mu. Erdos and Hechler proved the consistency of [mu in MAD(mu)] for a singular cardinal mu and asked if it was ever possible for a singular mu that [mu notin MAD(mu)], and also whether 2^{cf(mu)}
Kojman Menahem
Kubiś Wieslaw
Shelah Saharon
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