Question: Define = ( + ), and o, =-i( -), where the o' are Pauli spin matrices and f,f* obey anti-commutation relations {f, f}=0,{f, f}=1.

Define = ( + ), and o, =-i( -), where the o'

Define = ( + ), and o, =-i( -), where the o' are Pauli spin matrices and f,f* obey anti-commutation relations {f, f}=0,{f, f}=1. Then o is given by (a) f*f-1 (b) 2ff-1 (c) 2 f* f +1 (d) f* f

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