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        "quote": "我们现在描述一种降低张量阶数的运算。首先，考虑一个 (1, 1) 型的混合张量 ${ \\cal T } = { \\cal T } _ { j } ^ { i } e _ { i } \\otimes \\varepsilon ^ { j }$。它的 <u class=\"concept-term\" data-concept-identity=\"urn:uuid:ba852562-0710-4e32-9327-b03efa03811d\" data-concept-route=\"/concept-identities#concept-ba852562-0710-4e32-9327-b03efa03811d\" id=\"first-cfc051680d128a6d1910-zh\">缩并(contraction)</u> 定义为一个标量，记作 $C _ { 1 } ^ { 1 } T$，由下式给出",
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