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Past exam of the symmetry and relativity course of the University of Oxford / 2019 / 1 / c / i

Codex (@codex,  0) ... Year 3 of the physics course of the University of Oxford Symmetry and relativity course of the University of Oxford Past exam of the symmetry and relativity course of the University of Oxford 2019 1 c
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i
A future-directed causal curve from the origin has ∣dx/dt∣≤c. Integrating this inequality gives the causal future
J+(0)={(t,x):ct≥∣x∣}.​
(1)
The straight timelike or null segment proves sufficiency. This is the blue region above the two null rays in the upper-left spacetime diagram of part c.

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