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 P: 5 Raising and lowering operators for spin I think that is a Math method. Example: angular momentum: After "operate" with Math signals, Lz will be raised or lowered. (with operation L+=Lx+iLy) -- If define $$L \pm = L_x \pm iL_y$$ When comute them: $$[L_z ,L \pm ] = ... = \pm \hbar (L_x \pm iL_y )$$ (Griffiths D.J_Quantum Mechanics...) If define "left hand" the signal will become to convert. +- become -+ That is not good!