Given a subset of the hyperbolic upper half plane, say an ideal triangle (so with vertices on the boundary), what is the cardinality of all points contained in the interior?
What is the cardinality of a subset of the hyperbolic upper half plane?
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set-theory
hyperbolic-geometry
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1You might as well just ask: what is the cardinality of an open subset of $\mathbb{R}^2$? This is more general, and makes clear that there is not really any hyperbolic geometry in the question. – 2011-02-15