# Spin Quantization, Double Covers and the Dirac Cup Trick

Written: 24/12/2012
Last edited: 24/12/2012
Filed under: Specialist Topics, Quantum Physics, Mathematical Physics

[Outline of how notion of deforming symmetries back to identity more fundamental than merely looking like the identity in a naive transformation; thus to universal cover. Mention of 2D case. Demonstration that SO(3) is not simply connected. Demonstration that SU(2) is the universal cover of SO(3).]

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