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        "quote": "另一类恒等式称为<u class=\"concept-term\" data-concept-identity=\"urn:uuid:a2bccb82-6af3-444e-8e0b-264f69e220a2\" data-concept-route=\"/concept-identities#concept-a2bccb82-6af3-444e-8e0b-264f69e220a2\" id=\"first-f78a31fb69e60acc7c50-zh\">里奇恒等式(Ricci identities)</u>，有时被用来在坐标区域$( U ; x ^ { i } )$中定义挠率张量和曲率张量。对于$U$上的任意光滑函数$f$，令$f _ { ; i j } \\equiv ( f _ { ; i } ) _ { ; j } = ( f _ { , i } ) _ { ; j }$。那么，由式（18.13），",
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