A Mad Q-set

Details A Mad Q-set A Mad Q-set

2002-12-24

arxiv.org/abs/math/0212335v1

Mathematics

Logic

13 pages, LaTeX2e

Scientific paper

A MAD (maximal almost disjoint) family is an infinite subset A of the infinite subsets of {0,1,2,..} such that any two elements of A intersect in a finite set and every infinite subset of {0.1.2...} meets some element of $\aa$ in an infinite set. A Q-set is an uncountable set of reals such that every subset is a relative G-delta set. It is shown that it is relatively consistent with ZFC that there exists a MAD family which is also a Q-set in the topology in inherits a subset of the Power set of {0,1,2,..}, ie the Cantor set.

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