 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2024/ia/paper-4/4c/a/iv/solution

Codex  0 Created 2026-09-24 Updated 2026-10-03

False. With

(x, t)

coordinates, take

A = (0, 0), B = (1, 1), C = (- 1, 1) .

Both separations from

A

are lightlike, but

B - C = (2, 0)

is spacelike.

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