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        "quote": "物理学家沿用狄拉克（Dirac）引入的[<span id=\"concept-4-dirac-notation\" class=\"block-anchor\"></span><u class=\"concept-term\" data-concept-id=\"concept-4-dirac-notation\" data-concept-role=\"discussion\" data-concept-identity=\"urn:uuid:89b660bc-0d4b-4aad-8a17-de594b19d0dc\" data-concept-route=\"/concept-identities#concept-89b660bc-0d4b-4aad-8a17-de594b19d0dc\" id=\"first-788cbaf33477cfe0ea44-zh\">狄拉克记号(Dirac notation)</u>]，表示带厄米内积的复向量空间及其对偶空间中的元素；量子理论的态空间 $H$ 就是一个例子。这种向量空间 $V$ 的一个元素写作<span id=\"concept-4-ket-vector\" class=\"block-anchor\"></span><u class=\"concept-term\" data-concept-id=\"concept-4-ket-vector\" data-concept-role=\"definition\" data-concept-identity=\"urn:uuid:a461cea2-cf70-40b2-957b-c1532889d160\" data-concept-route=\"/concept-identities#concept-a461cea2-cf70-40b2-957b-c1532889d160\" id=\"first-78b64e180d2a96799ae6-zh\">右矢(ket vector)</u>",
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