Ultraparallel theorem: Difference between revisions

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In [[hyperbolic geometry]], the '''ultraparallel theorem''' states that every pair of [[ultraparallel line]]s in the [[hyperbolic geometry#Models_of_the_hyperbolic_plane|hyperbolic plane]] has a unique common [[perpendicular]] hyperbolic line.
 
==Proof in the Poincaré half-plane model==