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arxiv: 0805.2033 · v1 · submitted 2008-05-14 · 🧮 math.LO · math.CO

On pairs of definable orthogonal families

classification 🧮 math.LO math.CO
keywords familiesm-familyorthogonalanalyticcontaineddefinablehereditaryimplicitly
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We introduce the notion of an M-family of infinite subsets of $\nn$ which is implicitly contained in the work of A. R. D. Mathias. We study the structure of a pair of orthogonal hereditary families $\aaa$ and $\bbb$, where $\aaa$ is analytic and $\bbb$ is $C$-measurable and an M-family.

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