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===== Angles and Speeds =====

(Lecture: 20 minutes)

    * Interpret hyperbolic trig functions as speed (and gamma)
    * Addition formula
    * Lorentz transformations

See (ss)[[gsr>book:gsr:lorentz|5.2]] and
(ss)[[gsr>book:gsr:vaddition|6.1]] of [[gsr>|the text]].

==== Reflections ====

This lecture finally relates hyperbolic trig to velocity, showing that Lorentz
transformations are nothing more than hyperbolic rotations --- and the
Einstein addition formula is nothing more than the addition formula for
hyperbolic trig functions.

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