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      "label": "类时向量(timelike vector)",
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        "range": [
          10022,
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        ],
        "quote": "向量 $v\\in M^4$ 满足 $|v|^2=v\\cdot v>0$ 时，称为[<u class=\"concept-term\" data-concept-reference=\"concepts/geometry/spacelike-vector\" data-concept-identity=\"urn:uuid:903eac38-d4eb-4e4a-b7d4-a25741bba472\" data-concept-route=\"/concept-identities#concept-903eac38-d4eb-4e4a-b7d4-a25741bba472\" id=\"first-f5841724552749dfac35-zh\">类空向量(spacelike vector)</u>](../../../../../concepts/geometry/spacelike-vector)；满足 $|v|^2<0$ 时，称为[<u class=\"concept-term\" data-concept-reference=\"concepts/geometry/timelike-vector\" data-concept-identity=\"urn:uuid:132c84d0-902e-4ab2-91b9-d41dd49e754c\" data-concept-route=\"/concept-identities#concept-132c84d0-902e-4ab2-91b9-d41dd49e754c\" id=\"first-08e3f1fa825acf85da13-zh\">类时向量(timelike vector)</u>](../../../../../concepts/geometry/timelike-vector)；满足 $|v|^2=0$ 时，位于[<u class=\"concept-term\" data-concept-reference=\"concepts/geometry/light-cone\" data-concept-identity=\"urn:uuid:3fafde9b-d338-4ed8-8089-0bfa0ee48b30\" data-concept-route=\"/concept-identities#concept-3fafde9b-d338-4ed8-8089-0bfa0ee48b30\" id=\"first-1f36e4e2df075fdc2203-zh\">光锥(light cone)</u>](../../../../../concepts/geometry/light-cone)上。略去一个空间维数后，示意图如下：",
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