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dbr:Index_of_radio_propagation_articles
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dbr:Conjugate_points
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Спряжені точки Conjugate points Сопряжённые точки
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In differential geometry, conjugate points or focal points are, roughly, points that can almost be joined by a 1-parameter family of geodesics. For example, on a sphere, the north-pole and south-pole are connected by any meridian. Another viewpoint is that conjugate points tell when the geodesics fail to be length-minimizing. All geodesics are locally length-minimizing, but not globally. For example on a sphere, any geodesic passing through the north-pole can be extended to reach the south-pole, and hence any geodesic segment connecting the poles is not (uniquely) globally length minimizing. This tells us that any pair of antipodal points on the standard 2-sphere are conjugate points. В рімановій геометрії поняття спря́жених точок відіграє важливу роль у вивченні мінімізуючих властивостей геодезичних ліній. Сопряжённые точки — вершины инфинитезимально узкого геодезического двуугольника в Римановом многообразии.
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Сопряжённые точки — вершины инфинитезимально узкого геодезического двуугольника в Римановом многообразии. In differential geometry, conjugate points or focal points are, roughly, points that can almost be joined by a 1-parameter family of geodesics. For example, on a sphere, the north-pole and south-pole are connected by any meridian. Another viewpoint is that conjugate points tell when the geodesics fail to be length-minimizing. All geodesics are locally length-minimizing, but not globally. For example on a sphere, any geodesic passing through the north-pole can be extended to reach the south-pole, and hence any geodesic segment connecting the poles is not (uniquely) globally length minimizing. This tells us that any pair of antipodal points on the standard 2-sphere are conjugate points. В рімановій геометрії поняття спря́жених точок відіграє важливу роль у вивченні мінімізуючих властивостей геодезичних ліній.
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