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Reference.org
Ultraparallel theorem
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<p>In <a href="/facts/Hyperbolic_geometry/DjTMKdgy">hyperbolic geometry</a>, two lines are said to be ultraparallel if they do not intersect and are not <a href="/facts/Limiting_parallel/0zRSgp7h">limiting parallel</a>. </p><p>The ultraparallel theorem states that every pair of (distinct) ultraparallel lines has a unique common <a href="/facts/Perpendicular/u0k8xqx4">perpendicular</a> (a hyperbolic line which is perpendicular to both lines). </p>