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comparison triangle : ウィキペディア英語版 | comparison triangle Define as the 2-dimensional metric space of constant curvature . So, for example, is the Euclidean plane, is the surface of the unit sphere, and is the hyperbolic plane. Let be a metric space. Let be a triangle in , with vertices , and . A comparison triangle in for is a triangle in with vertices , and such that , and . Such a triangle is unique up to isometry. The interior angle of at is called the comparison angle between and at . This is well-defined provided and are both distinct from . ==References==
* M Bridson & A Haefliger - ''Metric Spaces Of Non-Positive Curvature'', ISBN 3-540-64324-9
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「comparison triangle」の詳細全文を読む
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