## Spacetime

(Lecture: 5 minutes)

• Maxwell's equations imply the speed of light is constant

See §2.2 of the text.

### Reflections

Having digressed to discuss paradoxes, this is a good time to remind the students that the constancy of the speed of light is fundamental to special relativity. Students should bear this fact in mind througout the subsequent introduction of spacetime diagrams and hyperbola trigonometry.

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