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3.1 Rotations and Angular-Momentum Commutation Relations 159 We are particularly interested in an infinitesimal form of Ry: (

70 -62 ol Rx(E)Ry(8) - Ry(8)R() = 82 0 0 o 0 0 = R(82)-1, (3.1.7) where all terms of order higher than e have been ignored th

3.1 Rotations and Angular-Momentum Commutation Relations 161 Sections 1.6 and 2.1, respectively, the appropriate infinitesima

about the z-axis by angle o, we consider Dc0) = Lim [-(51) :)) (3.1.16) Chapter 3 Theory of Angular Momentum In order to obt

Let us now return to the fundamental commutation relations for rotation op- erations (3.1.9) written in terms of the R matric

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5. Start from a general Euler rotation such as Daß = (a) D (B) D:() used in quantum mechanics, where for instance, Dz(y) = ex

0 0
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aj D, (Q), ByCP), 3(3) deprecents rotations Gis are nothing but Pauli Spin natrices Gi=0; so it fellows [02,3] =2i Eije te by

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