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        "quote": "微分方程组极大解的唯一性还表明，若$p$是$M$的任意一点，则存在唯一的极大测地线$\\sigma : [ 0 , a )$，其中$a \\le$，且以$p = \\sigma ( 0 )$处的任意指定切向量$\\dot { \\sigma } ( 0 ) = X _ { p }$为初始条件。使测地线满足<a href=\"#equation-18-9\" class=\"cross-reference\" id=\"xref-01-linear-connections-and-geodesics-7\" data-reference=\"equation-18-9\">式(18.9)</a>的参数$t$称为<u class=\"concept-term\" data-concept-identity=\"urn:uuid:49a9d4dc-b1df-4c2f-aa1c-041435108e07\" data-concept-route=\"/concept-identities#concept-49a9d4dc-b1df-4c2f-aa1c-041435108e07\" id=\"first-d1335b23c7468b19892f-zh\">仿射参数(affine parameter)</u>。在参数变换$t ^ { \\prime } = f ( t )$下，切向量变为",
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