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===== Spacetime =====

(Lecture: 5 minutes)

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

See (ss)[[gsr>book:gsr:postulates|2.2]] of [[gsr>|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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