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        "quote": "映射 $\\tau ^ { i } : \\mathcal T ( U ) \\times \\mathcal T ( U )  \\mathcal F ( U )$ 由 $\\tau$ 的 $\\mathcal{F}$-线性而在两个自变量上均为 $\\mathcal{F}$-线性的，并且是反对称的 $\\tau ^ { i } ( X , Y ) = - \\tau ^ { i } ( Y , X )$。因此，它们是 $U$ 上的微分二形式，称为 <u class=\"concept-term\" data-concept-identity=\"urn:uuid:9d30b85b-344c-429f-b827-475935331862\" data-concept-route=\"/concept-identities#concept-9d30b85b-344c-429f-b827-475935331862\" id=\"first-aa6c8a8deea6b25d0dcb-zh\">挠率二形式(torsion 2-form)</u>。",
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