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Poincaré half-plane model

In non-Euclidean geometry, the Poincaré half-plane model is the upper half-plane, denoted below as H {\displaystyle =\{\langle x, y\rangle \mid y>0;x, y\in \mathbb {R} \}}, together with a metric, the Poincaré metric, that makes it a model of... Wikipedia