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        "range": [
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        "quote": "For $v\\in M^4$, $|v|^2=v\\cdot v>0$ means [<u class=\"concept-term\" data-concept-reference=\"concepts/geometry/spacelike-vector\" data-concept-identity=\"urn:uuid:a013ad57-8c7e-4a67-8001-ba939965b6c8\" data-concept-route=\"/concept-identities#concept-a013ad57-8c7e-4a67-8001-ba939965b6c8\" id=\"first-afbfa88720c82c722652-en\">spacelike</u>](../../../../../concepts/geometry/spacelike-vector), $|v|^2<0$ means [<u class=\"concept-term\" data-concept-reference=\"concepts/geometry/timelike-vector\" data-concept-identity=\"urn:uuid:6bcac000-f712-409e-b09d-925136bf96c2\" data-concept-route=\"/concept-identities#concept-6bcac000-f712-409e-b09d-925136bf96c2\" id=\"first-adc5c790641d95ac2f09-en\">timelike</u>](../../../../../concepts/geometry/timelike-vector), and $|v|^2=0$ places $v$ on the [<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-en\">light cone</u>](../../../../../concepts/geometry/light-cone). Suppressing one spatial dimension gives the following picture:",
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