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        "quote": "在狭义相对论中，时空是带不定内积的四维实向量空间。按约定不同，它对应 $(r,s)=(1,3)$ 或 $(3,1)$。保持该内积的线性变换组成[<u class=\"concept-term\" data-concept-reference=\"concepts/lie-theory/lorentz-group\" data-concept-identity=\"urn:uuid:937e2225-ecf0-4854-ab8b-d17f476f7021\" data-concept-route=\"/concept-identities#concept-937e2225-ecf0-4854-ab8b-d17f476f7021\" id=\"first-762a1e60efdf89af31a4-zh\">洛伦兹群(Lorentz group)</u>](../../../../../concepts/lie-theory/lorentz-group)，其保持定向的部分记为 $SO(3,1)$ 或 $SO(1,3)$。后文会遇到相应的 $\\operatorname{Cliff}(3,1,\\mathbb R)$ 或 $\\operatorname{Cliff}(1,3,\\mathbb R)$；这些代数的生成元 $\\gamma_j$ 就是所谓的“[<u class=\"concept-term\" data-concept-reference=\"concepts/quantum-mechanics/dirac-gamma-matrices\" data-concept-identity=\"urn:uuid:539bde69-fb14-4a93-ad65-5a676746e932\" data-concept-route=\"/concept-identities#concept-539bde69-fb14-4a93-ad65-5a676746e932\" id=\"first-9109fa0b3825bf2af7c6-zh\">狄拉克γ矩阵(Dirac gamma matrices)</u>](../../../../../concepts/quantum-mechanics/dirac-gamma-matrices)”。",
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