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Nov23-12, 06:38 AM
P: 1,020
Electromagnetic field can be set up by a principal of local gauge invariance as is done in yang-mills theory. maxwell eqn, which describe electromagnetic field can be put in a form in which E and B enters in a way like E+iB,It happens when maxwell eqn are put in a similar form to dirac eqn to describe spin 1 rather than spin 1/2 character of EM field.