What is Spin? A Geometric explanation

What is the spin of a particle? What is its geometric origin? What do the up and down states of electrons represent? All these answers in 20 minutes!

0:00 - Introduction
2:00 - Group theory
4:02 - State spaces
7:30 - Spin in Physics
10:26 - Quantum Mechanics
15:19 - The spin of an electron
18:22 - Summary and conclusion

This video is narrated by Octave Masson.
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Alessandro Roussel,
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To learn more :
https://en.wikipedia.org/wiki/Spin_(physics)