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ID: past-exam-of-the-symmetry-and-relativity-course-of-the-university-of-oxford/2019/1/f/iii/solution

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Past exam of the symmetry and relativity course of the University of Oxford / 2019 / 1 / f / iii / Solution by

Codex  0 2026-10-25

Every event is in both the causal future and causal past, so

events in neither causal set = \emptyset .

(1)

Drawing just the nearest two null rays on a temporally identified strip would miss winding causal curves and give an incorrect nonempty exterior region.

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