## Angles and Speeds

(Lecture: 20 minutes)

• Interpret hyperbolic trig functions as speed (and gamma)
• Lorentz transformations

See §5.2 and §6.1 of 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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